rEFIt with multiple drives

[Fasopus]

I'm at a total loss for what to do here, I can see on the disk that grub is installed and is up to date, yet every time I select linux from the rEFIt menu it boots windows instead. The Ubuntu partition is /dev/sdd2, there is a /dev/sdd1 of EFI format that I can see, should I try putting grub there? The installer defaults to putting grub on the OSx drive, but if I put it there wont that cause later problems with booting to windows?

EDIT: Just tried installing GRUB in the EFI section, rEFIt says "Boot linux from EFI", yet it still boots into windows when I select it.

[srs5694]

It's starting to sound as if Linux might not be in your GRUB configuration file. Try booting from an emergency disk and posting the contents of /boot/grub/grub.cfg, between [code] and [/code] tags to keep it legible. Alternatively, you could run the Boot Info Script and post its RESULTS.txt file, which will have that and more information.

[Fasopus]

The contents of my grub.cfg file are as follows

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_gpt
insmod ext2
set root='(/dev/sdd,gpt1)'
search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod part_gpt
insmod ext2
set root='(/dev/sdd,gpt1)'
search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
set locale_dir=($root)/boot/grub/locale
set lang=en_CA
insmod gettext
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
  clear
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
if [ ${recordfail} != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, with Linux 2.6.38-8-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    set gfxpayload=$linux_gfx_mode
    insmod part_gpt
    insmod ext2
    set root='(/dev/sdd,gpt1)'
    search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
    linux    /boot/vmlinuz-2.6.38-8-generic root=UUID=a793e32c-f342-4a3c-b805-e59192d72741 ro   quiet splash vt.handoff=7
    initrd    /boot/initrd.img-2.6.38-8-generic
}
menuentry 'Ubuntu, with Linux 2.6.38-8-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    set gfxpayload=$linux_gfx_mode
    insmod part_gpt
    insmod ext2
    set root='(/dev/sdd,gpt1)'
    search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
    echo    'Loading Linux 2.6.38-8-generic ...'
    linux    /boot/vmlinuz-2.6.38-8-generic root=UUID=a793e32c-f342-4a3c-b805-e59192d72741 ro single 
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initrd.img-2.6.38-8-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
    insmod part_gpt
    insmod ext2
    set root='(/dev/sdd,gpt1)'
    search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
    linux16    /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod part_gpt
    insmod ext2
    set root='(/dev/sdd,gpt1)'
    search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
    linux16    /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Mac OS X (32-bit) (on /dev/sda2)" --class osx --class darwin --class os {
    insmod part_gpt
    insmod hfsplus
    set root='(/dev/sda,gpt2)'
    search --no-floppy --fs-uuid --set=root b65a461da7e3835a
        load_video
        set do_resume=0
        if [ /var/vm/sleepimage -nt10 / ]; then
           if xnu_resume /var/vm/sleepimage; then
             set do_resume=1
           fi
        fi
        if [ $do_resume = 0 ]; then
           xnu_uuid b65a461da7e3835a uuid
           if [ -f /Extra/DSDT.aml ]; then
              acpi -e /Extra/DSDT.aml
           fi
           xnu_kernel /mach_kernel boot-uuid=${uuid} rd=*uuid
           if [ /System/Library/Extensions.mkext -nt /System/Library/Extensions ]; then
              xnu_mkext /System/Library/Extensions.mkext
           else
              xnu_kextdir /System/Library/Extensions
           fi
           if [ -f /Extra/Extensions.mkext ]; then
              xnu_mkext /Extra/Extensions.mkext
           fi
           if [ -d /Extra/Extensions ]; then
              xnu_kextdir /Extra/Extensions
           fi
           if [ -f /Extra/devprop.bin ]; then
              xnu_devprop_load /Extra/devprop.bin
           fi
           if [ -f /Extra/splash.jpg ]; then
              insmod jpeg
              xnu_splash /Extra/splash.jpg
           fi
           if [ -f /Extra/splash.png ]; then
              insmod png
              xnu_splash /Extra/splash.png
           fi
           if [ -f /Extra/splash.tga ]; then
              insmod tga
              xnu_splash /Extra/splash.tga
           fi
        fi
}
menuentry "Mac OS X (64-bit) (on /dev/sda2)" --class osx --class darwin --class os {
    insmod part_gpt
    insmod hfsplus
    set root='(/dev/sda,gpt2)'
    search --no-floppy --fs-uuid --set=root b65a461da7e3835a
        load_video
        set do_resume=0
        if [ /var/vm/sleepimage -nt10 / ]; then
           if xnu_resume /var/vm/sleepimage; then
             set do_resume=1
           fi
        fi
        if [ $do_resume = 0 ]; then
           xnu_uuid b65a461da7e3835a uuid
           if [ -f /Extra/DSDT.aml ]; then
              acpi -e /Extra/DSDT.aml
           fi
           xnu_kernel64 /mach_kernel boot-uuid=${uuid} rd=*uuid
           if [ /System/Library/Extensions.mkext -nt /System/Library/Extensions ]; then
              xnu_mkext /System/Library/Extensions.mkext
           else
              xnu_kextdir /System/Library/Extensions
           fi
           if [ -f /Extra/Extensions.mkext ]; then
              xnu_mkext /Extra/Extensions.mkext
           fi
           if [ -d /Extra/Extensions ]; then
              xnu_kextdir /Extra/Extensions
           fi
           if [ -f /Extra/devprop.bin ]; then
              xnu_devprop_load /Extra/devprop.bin
           fi
           if [ -f /Extra/splash.jpg ]; then
              insmod jpeg
              xnu_splash /Extra/splash.jpg
           fi
           if [ -f /Extra/splash.png ]; then
              insmod png
              xnu_splash /Extra/splash.png
           fi
           if [ -f /Extra/splash.tga ]; then
              insmod tga
              xnu_splash /Extra/splash.tga
           fi
        fi
}
menuentry "Windows 7 (loader) (on /dev/sdc1)" --class windows --class os {
    insmod part_msdos
    insmod ntfs
    set root='(/dev/sdc,msdos1)'
    search --no-floppy --fs-uuid --set=root 4CA22BA6A22B940C
    chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

[srs5694]

Your GRUB configuration looks OK. You could try installing ELILO. You'll need to do this:

1. Download the ELILO binary files from here.
2. Mount your EFI System Partition (ESP) so you can access it. In OS X, you'd do "sudo mkdir /Volumes/ESP; sudo mount_msdos /dev/disk0s1 /Volumes/ESP", although you might need to change the device node name.
3. Create an EFI/elilo directory on the ESP (it'll be /Volumes/ESP/EFI/elilo if you mount as I suggested).
4. Copy the .efi file for your architecture (elilo-3.14-ia32.efi or elilo-x86_64.efi) to the EFI/elilo directory you just created.
5. Copy the Ubuntu kernel (vmlinuz-*) and initial RAM disk (initrd.img-*) files to the EFI/elilo directory. This is the tricky part, since you'll need access to your Ubuntu partition to do it. You should be able to do it from an Ubuntu live CD boot, though.
6. Create an elilo.conf file in the EFI/elilo directory. This will direct the boot process. See the example below.

Here's my elilo.conf file on a UEFI-based PC:

prompt
timeout=50
default=linux
#chooser=textmenu

image=vmlinuz-2.6.38-8-generic
        label=linux
        initrd=initrd.img-2.6.38-8-generic
        read-only
        root=/dev/sda5
        append=""

You'll need to modify the filenames for the Linux kernel (on the image= line), for the initial RAM disk (on the initrd= line), and for the root filesystem (on the root= line).

With any luck, when you're done, you should see a new entry in rEFIt to boot via ELILO and it should work. If it does, you'll have to maintain your ELILO configuration yourself whenever you upgrade your kernel. Note that ELILO can't read kernels and initial RAM disks from the Linux root (/) or /boot partition, so you'll have to copy them to the ESP, from which ELILO can read them.

[Fasopus]

Your GRUB configuration looks OK. You could try installing ELILO. You'll need to do this:

1. Download the ELILO binary files from here.
2. Mount your EFI System Partition (ESP) so you can access it. In OS X, you'd do "sudo mkdir /Volumes/ESP; sudo mount_msdos /dev/disk0s1 /Volumes/ESP", although you might need to change the device node name.
3. Create an EFI/elilo directory on the ESP (it'll be /Volumes/ESP/EFI/elilo if you mount as I suggested).
4. Copy the .efi file for your architecture (elilo-3.14-ia32.efi or elilo-x86_64.efi) to the EFI/elilo directory you just created.
5. Copy the Ubuntu kernel (vmlinuz-*) and initial RAM disk (initrd.img-*) files to the EFI/elilo directory. This is the tricky part, since you'll need access to your Ubuntu partition to do it. You should be able to do it from an Ubuntu live CD boot, though.
6. Create an elilo.conf file in the EFI/elilo directory. This will direct the boot process. See the example below.

Here's my elilo.conf file on a UEFI-based PC:

prompt
timeout=50
default=linux
#chooser=textmenu

image=vmlinuz-2.6.38-8-generic
        label=linux
        initrd=initrd.img-2.6.38-8-generic
        read-only
        root=/dev/sda5
        append=""

You'll need to modify the filenames for the Linux kernel (on the image= line), for the initial RAM disk (on the initrd= line), and for the root filesystem (on the root= line).

With any luck, when you're done, you should see a new entry in rEFIt to boot via ELILO and it should work. If it does, you'll have to maintain your ELILO configuration yourself whenever you upgrade your kernel. Note that ELILO can't read kernels and initial RAM disks from the Linux root (/) or /boot partition, so you'll have to copy them to the ESP, from which ELILO can read them.

So I'm reading your directions and I think I should be able to complete the steps but I'm wondering if doing this will have any effect on rEFIt or my functioning OSx/Windows 7 partitions, I mostly just don't understand what this is doing/changing. (something gives me the feeling that it would create extra options on the rEFIt menu)

[srs5694]

My procedure will create one new entry in the rEFIt menu. (If it works, you should be able to find a way to remove the non-functional entries, but that's something that's best dealt with later. Likewise, if it doesn't work, you can delete the ELILO files to delete the new entry.) My procedure will not delete any existing configurations (unless you happen to already have the EFI/elilo directory I suggested creating), so it shouldn't break anything.

Basically, you can thank Apple and Microsoft for an overly complicated booting system. Your Mac can boot in either of two ways, and rEFIt is providing you with a mish-mash of options for both methods of booting:

• Natively, Macs use the Extensible Firmware Interface (EFI) to boot. Normally, this works by the firmware detecting boot loader files on the EFI System Partition (ESP) and booting one of them. Apple extended this a bit so that a Mac's EFI loads the Mac's boot files from the OS X installation partition, but the principle is the same. EFI boot files (and some other types of EFI files) have .efi extensions, and rEFIt searches for such files and presents them as boot options.
• The Mac's firmware also supports a BIOS compatibility mode that it uses for booting Windows. In this mode, boot code in a disk's Master Boot Record (MBR; that is, the first sector of the disk) or in a partition's Partition Boot Record (PBR; the first sector of a partition) begins the boot process, which then continues through a convoluted path. rEFIt scans disks and partitions for likely MBR/BIOS boot code and, if it finds it, rEFIt presents these as options.

In both cases, rEFIt basically guesses at the name to present to you, so it may get the name wrong. This just adds to the confusion. IIRC, though, rEFIt does at least show you the path to the EFI boot loaders under the icons, which can help you identify what you're about to boot.

What's worse, it's easy to get mixed up about what's installed to the MBR (and to which MBR, if you've got multiple disks) and what's installed to what PBR. My suspicion at this point is that you've somehow gotten Windows boot code into locations where there should be GRUB boot code, and that rEFIt is therefore presenting Windows boot options as Linux boot options.

The method I've suggested adds ELILO, which in my experiments on non-Mac UEFI-based computers has been much more reliable than GRUB. I emphasize "non-Mac" because the Mac's EFI and typical PC UEFI implementations are a bit different, so I can't promise ELILO will work correctly on a Mac. I've also tested the handoff from rEFIt to ELILO (again, on non-Mac UEFI systems), and it seems to work fine.

The EFI boot process is less kludgey than the BIOS boot process, so it should be easier to debug once you start using it. Since there's something amiss in your current configuration, and since it seems to have something to do with the MBR/BIOS style booting, I figure it's best to switch to a purely EFI method of booting Linux, which means ELILO, a GRUB 2 configuration for EFI (flaky, in my experience), or a hacked GRUB Legacy with EFI support (rare, but used by Fedora).

[Fasopus]

I tried to get ELILO up and running yesterday but I couldn't get it to work, the rEFIt entry showed up but when selected didn't do anything, I removed all the ELILO files I added and I plan on giving it another chance tonight. I've also read that rEFIt reccommends using the LILO bootloader installed on the partition boot sector, but I havent found a good guide on how to install LILO from a live cd.


EDIT: I'm wondering if all of the problems are caused by the windows 7 bootloader install location. I don't remember being given an option as to where to place this bootloader, could it be possible that it got placed on the MBR instead of the PBR? Does anyone know how to check this and move it to the PBR of the windows drive? Or does the MBR issue only affect having multiple OS's and partitions on a given drive?

[srs5694]

At this point I think more and better data are in order. I suggest you post two things:

• The RESULTS.txt file created by the Boot Info Script. This will tell us what BIOS-style boot loaders are installed to what MBRs and PBRs.
• A list of all the .efi files in your ESP. You'll need to mount your ESP, as described in my earlier post, and then type 'find /Volumes/ESP -iname "*efi"' (changing the mount point as necessary).

Post both results here, between [code] and [/code] tags to keep it legible.

[Fasopus]

When I run the script the contents of the RESULTS.TXT are
[sda should be OSX, sdb a FAT storage drive, sdc Windows 7, sdd Ubuntu]

                 Boot Info Script 0.60    from 17 May 2011


============================= Boot Info Summary: ===============================

 => No boot loader is installed in the MBR of /dev/sda.
 => No boot loader is installed in the MBR of /dev/sdb.
 => Windows is installed in the MBR of /dev/sdc.
 => Syslinux MBR (3.00-3.35) is installed in the MBR of /dev/sdd.

sda1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  Unknown
    Boot sector info:   No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        

sda2: __________________________________________________________________________

    File system:       hfsplus
    Boot sector type:  -
    Boot sector info:  
    Operating System:  
    Boot files:        

sdb1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  Unknown
    Boot sector info:   According to the info in the boot sector, sdb1 starts 
                       at sector 0. But according to the info from fdisk, 
                       sdb1 starts at sector 40.
    Operating System:  
    Boot files:        

sdb2: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  Unknown
    Boot sector info:   According to the info in the boot sector, sdb2 starts 
                       at sector 0. But according to the info from fdisk, 
                       sdb2 starts at sector 411648.
    Operating System:  
    Boot files:        

sdc1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows Vista/7
    Boot sector info:   No errors found in the Boot Parameter Block.
    Operating System:  Windows 7
    Boot files:        /bootmgr /Boot/BCD /Windows/System32/winload.exe

sdd1: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  Grub2 (v1.99)
    Boot sector info:   Grub2 (v1.99) is installed in the boot sector of sdd1 
                       and looks at sector 151317770 of the same hard drive 
                       for core.img. core.img is at this location and looks 
                       for (,gpt1)/boot/grub on this drive.
    Operating System:  Ubuntu 11.04
    Boot files:        /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1                   1       409,639       409,639  ee GPT
/dev/sda2    *        409,640   624,880,263   624,470,624  af HFS / HFS+


GUID Partition Table detected.

Partition    Start Sector    End Sector  # of Sectors System
/dev/sda1              40       409,639       409,600 EFI System partition
/dev/sda2         409,640   624,880,263   624,470,624 Hierarchical File System Plus (HFS+) partition (Mac OS X)

Drive: sdb _____________________________________________________________________

Disk /dev/sdb: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdb1                   1       409,639       409,639  ee GPT
/dev/sdb2             411,648   488,396,799   487,985,152   b W95 FAT32


GUID Partition Table detected.

Partition    Start Sector    End Sector  # of Sectors System
/dev/sdb1              40       409,639       409,600 EFI System partition
/dev/sdb2         411,648   488,396,799   487,985,152 Data partition (Windows/Linux)

Drive: sdc _____________________________________________________________________

Disk /dev/sdc: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdc1    *          2,048 1,465,145,343 1,465,143,296   7 NTFS / exFAT / HPFS


GUID Partition Table detected, but does not seem to be used.

Partition    Start Sector    End Sector  # of Sectors System

Drive: sdd _____________________________________________________________________

Disk /dev/sdd: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdd1                   1            33            33  ee GPT
/dev/sdd2    *             34   156,300,815   156,300,782  83 Linux


GUID Partition Table detected.

Partition    Start Sector    End Sector  # of Sectors System
/dev/sdd1              34   156,300,815   156,300,782 Data partition (Windows/Linux)

"blkid" output: ________________________________________________________________

Device           UUID                                   TYPE       LABEL

/dev/loop0                                              squashfs   
/dev/sda1        2860-11F4                              vfat       EFI
/dev/sda2        ed19e5b6-4197-3a51-b5d5-4291e667efef   hfsplus    Macintosh HD
/dev/sdb1        70D6-1701                              vfat       EFI
/dev/sdb2        BCD6-130D                              vfat       DATA
/dev/sdc1        4CA22BA6A22B940C                       ntfs       Windows 7
/dev/sdd1        a793e32c-f342-4a3c-b805-e59192d72741   ext4       

================================ Mount points: =================================

Device           Mount_Point              Type       Options

/dev/loop0       /rofs                    squashfs   (ro,noatime)
/dev/sr0         /cdrom                   iso9660    (ro,noatime)


=========================== sdd1/boot/grub/grub.cfg: ===========================

--------------------------------------------------------------------------------
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_gpt
insmod ext2
set root='(/dev/sdd,gpt1)'
search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod part_gpt
insmod ext2
set root='(/dev/sdd,gpt1)'
search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
set locale_dir=($root)/boot/grub/locale
set lang=en_CA
insmod gettext
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
  clear
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
if [ ${recordfail} != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, with Linux 2.6.38-8-generic' --class ubuntu --class gnu-linux --class gnu --class os {
	recordfail
	set gfxpayload=$linux_gfx_mode
	insmod part_gpt
	insmod ext2
	set root='(/dev/sdd,gpt1)'
	search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
	linux	/boot/vmlinuz-2.6.38-8-generic root=UUID=a793e32c-f342-4a3c-b805-e59192d72741 ro   quiet splash vt.handoff=7
	initrd	/boot/initrd.img-2.6.38-8-generic
}
menuentry 'Ubuntu, with Linux 2.6.38-8-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
	recordfail
	set gfxpayload=$linux_gfx_mode
	insmod part_gpt
	insmod ext2
	set root='(/dev/sdd,gpt1)'
	search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
	echo	'Loading Linux 2.6.38-8-generic ...'
	linux	/boot/vmlinuz-2.6.38-8-generic root=UUID=a793e32c-f342-4a3c-b805-e59192d72741 ro single 
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd.img-2.6.38-8-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
	insmod part_gpt
	insmod ext2
	set root='(/dev/sdd,gpt1)'
	search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
	linux16	/boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
	insmod part_gpt
	insmod ext2
	set root='(/dev/sdd,gpt1)'
	search --no-floppy --fs-uuid --set=root a793e32c-f342-4a3c-b805-e59192d72741
	linux16	/boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Mac OS X (32-bit) (on /dev/sda2)" --class osx --class darwin --class os {
	insmod part_gpt
	insmod hfsplus
	set root='(/dev/sda,gpt2)'
	search --no-floppy --fs-uuid --set=root b65a461da7e3835a
        load_video
        set do_resume=0
        if [ /var/vm/sleepimage -nt10 / ]; then
           if xnu_resume /var/vm/sleepimage; then
             set do_resume=1
           fi
        fi
        if [ $do_resume = 0 ]; then
           xnu_uuid b65a461da7e3835a uuid
           if [ -f /Extra/DSDT.aml ]; then
              acpi -e /Extra/DSDT.aml
           fi
           xnu_kernel /mach_kernel boot-uuid=${uuid} rd=*uuid
           if [ /System/Library/Extensions.mkext -nt /System/Library/Extensions ]; then
              xnu_mkext /System/Library/Extensions.mkext
           else
              xnu_kextdir /System/Library/Extensions
           fi
           if [ -f /Extra/Extensions.mkext ]; then
              xnu_mkext /Extra/Extensions.mkext
           fi
           if [ -d /Extra/Extensions ]; then
              xnu_kextdir /Extra/Extensions
           fi
           if [ -f /Extra/devprop.bin ]; then
              xnu_devprop_load /Extra/devprop.bin
           fi
           if [ -f /Extra/splash.jpg ]; then
              insmod jpeg
              xnu_splash /Extra/splash.jpg
           fi
           if [ -f /Extra/splash.png ]; then
              insmod png
              xnu_splash /Extra/splash.png
           fi
           if [ -f /Extra/splash.tga ]; then
              insmod tga
              xnu_splash /Extra/splash.tga
           fi
        fi
}
menuentry "Mac OS X (64-bit) (on /dev/sda2)" --class osx --class darwin --class os {
	insmod part_gpt
	insmod hfsplus
	set root='(/dev/sda,gpt2)'
	search --no-floppy --fs-uuid --set=root b65a461da7e3835a
        load_video
        set do_resume=0
        if [ /var/vm/sleepimage -nt10 / ]; then
           if xnu_resume /var/vm/sleepimage; then
             set do_resume=1
           fi
        fi
        if [ $do_resume = 0 ]; then
           xnu_uuid b65a461da7e3835a uuid
           if [ -f /Extra/DSDT.aml ]; then
              acpi -e /Extra/DSDT.aml
           fi
           xnu_kernel64 /mach_kernel boot-uuid=${uuid} rd=*uuid
           if [ /System/Library/Extensions.mkext -nt /System/Library/Extensions ]; then
              xnu_mkext /System/Library/Extensions.mkext
           else
              xnu_kextdir /System/Library/Extensions
           fi
           if [ -f /Extra/Extensions.mkext ]; then
              xnu_mkext /Extra/Extensions.mkext
           fi
           if [ -d /Extra/Extensions ]; then
              xnu_kextdir /Extra/Extensions
           fi
           if [ -f /Extra/devprop.bin ]; then
              xnu_devprop_load /Extra/devprop.bin
           fi
           if [ -f /Extra/splash.jpg ]; then
              insmod jpeg
              xnu_splash /Extra/splash.jpg
           fi
           if [ -f /Extra/splash.png ]; then
              insmod png
              xnu_splash /Extra/splash.png
           fi
           if [ -f /Extra/splash.tga ]; then
              insmod tga
              xnu_splash /Extra/splash.tga
           fi
        fi
}
menuentry "Windows 7 (loader) (on /dev/sdc1)" --class windows --class os {
	insmod part_msdos
	insmod ntfs
	set root='(/dev/sdc,msdos1)'
	search --no-floppy --fs-uuid --set=root 4CA22BA6A22B940C
	chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
--------------------------------------------------------------------------------

=============================== sdd1/etc/fstab: ================================

--------------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
/dev/sdd1       /               ext4    errors=remount-ro 0       1
--------------------------------------------------------------------------------

=================== sdd1: Location of files loaded by Grub: ====================

           GiB - GB             File                                 Fragment(s)

  72.153962135 = 77.474726912   boot/grub/core.img                             1
  12.144886971 = 13.040473088   boot/grub/grub.cfg                             1
   0.660386086 = 0.709084160    boot/initrd.img-2.6.38-8-generic               1
  72.191727638 = 77.515277312   boot/vmlinuz-2.6.38-8-generic                  1
   0.660386086 = 0.709084160    initrd.img                                     1
  72.191727638 = 77.515277312   vmlinuz                                        1

======================== Unknown MBRs/Boot Sectors/etc: ========================

Unknown BootLoader on sda1

00000000  eb 58 90 42 53 44 20 20  34 2e 34 00 02 01 20 00  |.X.BSD  4.4... .|
00000010  02 00 00 00 00 f0 00 00  3f 00 10 00 28 00 00 00  |........?...(...|
00000020  00 40 06 00 67 0c 00 00  00 00 00 00 02 00 00 00  |.@..g...........|
00000030  01 00 06 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000040  00 00 29 f4 11 60 28 45  46 49 20 20 20 20 20 20  |..)..`(EFI      |
00000050  20 20 46 41 54 33 32 20  20 20 fa 31 c0 8e d0 bc  |  FAT32   .1....|
00000060  00 7c fb 8e d8 e8 00 00  5e 83 c6 19 bb 07 00 fc  |.|......^.......|
00000070  ac 84 c0 74 06 b4 0e cd  10 eb f5 30 e4 cd 16 cd  |...t.......0....|
00000080  19 0d 0a 4e 6f 6e 2d 73  79 73 74 65 6d 20 64 69  |...Non-system di|
00000090  73 6b 0d 0a 50 72 65 73  73 20 61 6e 79 20 6b 65  |sk..Press any ke|
000000a0  79 20 74 6f 20 72 65 62  6f 6f 74 0d 0a 00 00 00  |y to reboot.....|
000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
00000200

Unknown BootLoader on sdb1

00000000  eb 58 90 42 53 44 20 20  34 2e 34 00 02 01 20 00  |.X.BSD  4.4... .|
00000010  02 00 00 00 00 f0 00 00  20 00 10 00 00 00 00 00  |........ .......|
00000020  00 40 06 00 4f 0c 00 00  00 00 00 00 02 00 00 00  |.@..O...........|
00000030  01 00 06 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000040  00 00 29 01 17 d6 70 45  46 49 20 20 20 20 20 20  |..)...pEFI      |
00000050  20 20 46 41 54 33 32 20  20 20 fa 31 c0 8e d0 bc  |  FAT32   .1....|
00000060  00 7c fb 8e d8 e8 00 00  5e 83 c6 19 bb 07 00 fc  |.|......^.......|
00000070  ac 84 c0 74 06 b4 0e cd  10 eb f5 30 e4 cd 16 cd  |...t.......0....|
00000080  19 0d 0a 4e 6f 6e 2d 73  79 73 74 65 6d 20 64 69  |...Non-system di|
00000090  73 6b 0d 0a 50 72 65 73  73 20 61 6e 79 20 6b 65  |sk..Press any ke|
000000a0  79 20 74 6f 20 72 65 62  6f 6f 74 0d 0a 00 00 00  |y to reboot.....|
000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
00000200

Unknown BootLoader on sdb2

00000000  eb 58 90 42 53 44 20 20  34 2e 34 00 02 40 20 00  |.X.BSD  4.4..@ .|
00000010  02 00 00 00 00 f0 00 00  20 00 ff 00 00 00 00 00  |........ .......|
00000020  00 10 16 1d a2 e8 00 00  00 00 00 00 02 00 00 00  |................|
00000030  01 00 06 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000040  00 00 29 0d 13 d6 bc 44  41 54 41 20 20 20 20 20  |..)....DATA     |
00000050  20 20 46 41 54 33 32 20  20 20 fa 31 c0 8e d0 bc  |  FAT32   .1....|
00000060  00 7c fb 8e d8 e8 00 00  5e 83 c6 19 bb 07 00 fc  |.|......^.......|
00000070  ac 84 c0 74 06 b4 0e cd  10 eb f5 30 e4 cd 16 cd  |...t.......0....|
00000080  19 0d 0a 4e 6f 6e 2d 73  79 73 74 65 6d 20 64 69  |...Non-system di|
00000090  73 6b 0d 0a 50 72 65 73  73 20 61 6e 79 20 6b 65  |sk..Press any ke|
000000a0  79 20 74 6f 20 72 65 62  6f 6f 74 0d 0a 00 00 00  |y to reboot.....|
000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
00000200


=============================== StdErr Messages: ===============================

unlzma: Decoder error

Then when I do the find on /Volumes/ESP I get nothing returned, however if I do run the find on the /Volumes directory I recieve the following output

/Volumes/Windows 7/Windows/Boot/DVD/EFI
/Volumes/Windows 7/Windows/Boot/EFI
/Volumes/Windows 7/Windows/Boot/EFI/bootmgfw.efi
/Volumes/Windows 7/Windows/Boot/EFI/bootmgr.efi
/Volumes/Windows 7/Windows/Boot/EFI/memtest.efi
/Volumes/Windows 7/Windows/System32/Boot/winload.efi
/Volumes/Windows 7/Windows/System32/Boot/winresume.efi
/Volumes/Windows 7/Windows/System32/winload.efi
/Volumes/Windows 7/Windows/System32/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16385_none_c52d88d1a67ba4c0/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16385_none_c52d88d1a67ba4c0/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16757_none_c55000c1a6617837/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16757_none_c55000c1a6617837/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.20897_none_c5ae5ddcbf9f87c5/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.20897_none_c5ae5ddcbf9f87c5/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.17556_none_c7355d7da388cacc/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.17556_none_c7355d7da388cacc/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.21655_none_c7bdf9febca7513f/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.21655_none_c7bdf9febca7513f/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..ore-bootmanager-efi_31bf3856ad364e35_6.1.7600.16385_none_e375da7eb610e1bf/bootmgfw.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..ore-bootmanager-efi_31bf3856ad364e35_6.1.7600.16385_none_e375da7eb610e1bf/bootmgr.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..re-memorydiagnostic_31bf3856ad364e35_6.1.7600.16385_none_342a40111e4e6165/memtest.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16385_none_b71babd98657e6ef/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16385_none_b71babd98657e6ef/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16757_none_b73e23c9863dba66/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16757_none_b73e23c9863dba66/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.20897_none_b79c80e49f7bc9f4/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.20897_none_b79c80e49f7bc9f4/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.17556_none_b923808583650cfb/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.17556_none_b923808583650cfb/winresume.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.21655_none_b9ac1d069c83936e/winload.efi
/Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.21655_none_b9ac1d069c83936e/winresume.efi
/Volumes/Windows 7/Windows/Boot/DVD/EFI /Volumes/Windows 7/Windows/Boot/EFI /Volumes/Windows 7/Windows/Boot/EFI/bootmgfw.efi /Volumes/Windows 7/Windows/Boot/EFI/bootmgr.efi /Volumes/Windows 7/Windows/Boot/EFI/memtest.efi /Volumes/Windows 7/Windows/System32/Boot/winload.efi /Volumes/Windows 7/Windows/System32/Boot/winresume.efi /Volumes/Windows 7/Windows/System32/winload.efi /Volumes/Windows 7/Windows/System32/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16385_none_c52d88d1a67ba4c0/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16385_none_c52d88d1a67ba4c0/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16757_none_c55000c1a6617837/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.16757_none_c55000c1a6617837/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.20897_none_c5ae5ddcbf9f87c5/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7600.20897_none_c5ae5ddcbf9f87c5/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.17556_none_c7355d7da388cacc/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.17556_none_c7355d7da388cacc/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.21655_none_c7bdf9febca7513f/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..environment-windows_31bf3856ad364e35_6.1.7601.21655_none_c7bdf9febca7513f/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..ore-bootmanager-efi_31bf3856ad364e35_6.1.7600.16385_none_e375da7eb610e1bf/bootmgfw.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..ore-bootmanager-efi_31bf3856ad364e35_6.1.7600.16385_none_e375da7eb610e1bf/bootmgr.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..re-memorydiagnostic_31bf3856ad364e35_6.1.7600.16385_none_342a40111e4e6165/memtest.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16385_none_b71babd98657e6ef/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16385_none_b71babd98657e6ef/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16757_none_b73e23c9863dba66/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.16757_none_b73e23c9863dba66/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.20897_none_b79c80e49f7bc9f4/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7600.20897_none_b79c80e49f7bc9f4/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.17556_none_b923808583650cfb/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.17556_none_b923808583650cfb/winresume.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.21655_none_b9ac1d069c83936e/winload.efi /Volumes/Windows 7/Windows/winsxs/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.1.7601.21655_none_b9ac1d069c83936e/winresume.efi

[srs5694]

My instruction to look in /Volumes/ESP was based on the instruction that you mount it, as described in post #14 in this thread. That information may still be useful, but I have some observations and suggestions from the data you have provided:

• /dev/sda, /dev/sdb, and /dev/sdd all have unnecessary hybrid MBRs, which are accidents waiting to happen. What's more, the presence of a hybrid MBR on /dev/sdd might be related to your problem. You might want to eliminate at least that hybrid MBR, and perhaps the ones on /dev/sda and /dev/sdb, in favor of a legal protective MBR. You can do that with my GPT fdisk (gdisk) program, as follows:
  
  
  1. Launch gdisk on the disk by typing "sudo gdisk /dev/disk3". (I'm assuming you'll run the OS X version from OS X, hence the OS X-style disk identifier.)
  2. Type "p" to view the partition table and verify you're working on the correct disk. If not, type "q" to quit without saving your changes and try again with another disk identifier until you find the correct disk.
  3. Type "x" to enter the experts' menu.
  4. Type "n" to create a new protective MBR. You'll see no confirmation, just a new prompt.
  5. Type "w" to save your changes.
  
  
• Your /dev/sdc is an MBR disk with traces of old GPT data on it. This will confuse partitioning tools such as GParted into thinking the disk is empty. It's conceivable this situation is contributing to your boot problems. I recommend you fix it. The easiest way is to run my FixParts program on the disk. You can do this using the OS X version. See the FixParts Web page for a full description.
• You've got the MBR version of SYSLINUX installed in the MBR of /dev/sdd. This is probably what's redirecting the boot process to Windows. What I'm about to suggest should wipe it out....
• I recommend using GParted from a Linux emergency boot disk to shrink your Linux partition by ~1 MiB and create a BIOS Boot Partition in the free space. You might not need it, depending on how you ultimately resolve the problem, but it will be necessary for some types of booting, such as the one I'm about to have you set up.
• After you've set up a BIOS Boot Partition, use Super GRUB 2 Disk to boot Linux. When you boot with this disc, it should be able to discover your Linux installation and boot it. You should then be able to install GRUB 2 to the MBR of /dev/sdd by typing "sudo grub-install /dev/sdd". Note that's "/dev/sdd", not "/dev/sdd1" or any other partition number. This will wipe out the SYSLINUX on the MBR and use the BIOS Boot Partition. With any luck, when you reboot rEFIt will then give you a new Linux boot option (replacing one that didn't work) that will boot GRUB 2. (It's conceivable that rEFIt will misidentify or be unable to identify GRUB as a Linux option, but that's a minor cosmetic issue.) If it doesn't (if the Linux option goes away entirely and isn't replaced by anything), you'll have to go for a straight-EFI boot option, which I'll describe if that becomes necessary.