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Thread: How to bypass the 4-partitions limit?

  1. #21
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    Re: How to bypass the 4-partitions limit?

    Quote Originally Posted by cyberdork33 View Post
    You don't have an issue with the 4 partition "limit" as long as you are not trying to boot from the 5th partition.
    Got it, thanks.
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  2. #22
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    Re: How to bypass the 4-partitions limit?

    Ufortunately I have run in to a problem.

    I created a FAT32 parition which I placed after my swap partition.

    Now rEFIt only shows the OSX and FAT32 partitions as boot options? I ran the rEFIt partition analyzer and still the same problem. Ubuntu is missing from the list.


    *** Report for internal hard disk ***

    Current GPT partition table:
    # Start LBA End LBA Type
    1 40 409639 EFI System (FAT)
    2 409640 139669109 Mac OS X HFS+
    3 139669110 199173869 Basic Data
    4 199173870 209857094 Linux Swap
    5 209857095 234436544 MS Reserved

    Current MBR partition table:
    # A Start LBA End LBA Type
    1 1 409639 ee EFI Protective
    2 409640 139669109 af Mac OS X HFS+
    3 * 139669110 199173869 83 Linux
    4 199173870 209857094 82 Linux swap / Solaris

    MBR contents:
    Boot Code: Unknown, but bootable

    Partition at LBA 40:
    Boot Code: None (Non-system disk message)
    File System: FAT32
    Listed in GPT as partition 1, type EFI System (FAT)

    Partition at LBA 409640:
    Boot Code: None
    File System: HFS Extended (HFS+)
    Listed in GPT as partition 2, type Mac OS X HFS+
    Listed in MBR as partition 2, type af Mac OS X HFS+

    Partition at LBA 139669110:
    Boot Code: None
    File System: ext3
    Listed in GPT as partition 3, type Basic Data
    Listed in MBR as partition 3, type 83 Linux, active

    Partition at LBA 199173870:
    Boot Code: None
    File System: Unknown
    Listed in GPT as partition 4, type Linux Swap
    Listed in MBR as partition 4, type 82 Linux swap / Solaris

    Partition at LBA 209857095:
    Boot Code: Unknown, but bootable
    File System: FAT32
    Listed in GPT as partition 5, type MS Reserved
    Last edited by PartisanEntity; November 7th, 2008 at 06:05 PM.
    Recommended Resources: Ubuntu Linux Resources | Ask Ubuntu

  3. #23
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    Re: How to bypass the 4-partitions limit?

    The "Basic Data" partition is your Ubuntu partition.

    You probably need to install GRUB again to the root partition (/dev/sda3). You can boot a LiveCD and do this. This is shown here:
    http://ubuntuforums.org/showpost.php...3&postcount=11

  4. #24
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    Re: How to bypass the 4-partitions limit?

    Thanks very much, worked and am now back in Ubuntu
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  5. #25
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    Re: How to bypass the 4-partitions limit?

    Now that I finally have my 5th partition, I can access it from Ubuntu but can't mount it in Leopard.

    Any ideas?

    Current GPT partition table:
    # Start LBA End LBA Type
    1 40 409639 EFI System (FAT)
    2 409640 139669109 Mac OS X HFS+
    3 139669110 199173869 Basic Data
    4 199173870 209857094 Linux Swap
    5 209857095 234436544 MS Reserved

    Current MBR partition table:
    # A Start LBA End LBA Type
    1 1 409639 ee EFI Protective
    2 409640 139669109 af Mac OS X HFS+
    3 * 139669110 199173869 83 Linux
    4 199173870 209857094 82 Linux swap / Solaris

    MBR contents:
    Boot Code: Unknown, but bootable

    Partition at LBA 40:
    Boot Code: None (Non-system disk message)
    File System: FAT32
    Listed in GPT as partition 1, type EFI System (FAT)

    Partition at LBA 409640:
    Boot Code: None
    File System: HFS Extended (HFS+)
    Listed in GPT as partition 2, type Mac OS X HFS+
    Listed in MBR as partition 2, type af Mac OS X HFS+

    Partition at LBA 139669110:
    Boot Code: GRUB
    File System: ext3
    Listed in GPT as partition 3, type Basic Data
    Listed in MBR as partition 3, type 83 Linux, active

    Partition at LBA 199173870:
    Boot Code: None
    File System: Unknown
    Listed in GPT as partition 4, type Linux Swap
    Listed in MBR as partition 4, type 82 Linux swap / Solaris

    Partition at LBA 209857095:
    Boot Code: None (Non-system disk message)
    File System: FAT32
    Listed in GPT as partition 5, type MS Reserved
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  6. #26
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    Re: How to bypass the 4-partitions limit?

    It seems that your fifth partition got the MS Reserved flag set in the GPT. This causes the partition to become inaccessible in OS X. It seems to be a bug in gparted. Here is some info about it.

    http://discussions.apple.com/thread....51&tstart=4290
    http://www.macosxhints.com/article.p...80130022147512
    http://forum.insanelymac.com/lofiver...hp/t31562.html

  7. #27
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    Re: How to bypass the 4-partitions limit?

    I have found that most of the problems related to the GPT partition table can be solved by going MBR-only. OS X does not need a GPT. From what I remember when I did it, you first blank out the EFI protective partition, then delete it, and you can use the freed 4th partition to make an extended partition (which you can now do if you couldn't previously due to the GPT) and put logical partitions in the extended partition.

    I recommend backing up your MBR before you do this just in case something happens.
    My laptop: Black Macbook, running Elive with sid repos <-- needs repair
    New desktop with 3x 22" LCD <-- Xinerama not working right
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  8. #28
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    Re: How to bypass the 4-partitions limit?

    Quote Originally Posted by cyberdork33 View Post
    It seems that your fifth partition got the MS Reserved flag set in the GPT. This causes the partition to become inaccessible in OS X. It seems to be a bug in gparted. Here is some info about it.

    http://discussions.apple.com/thread....51&tstart=4290
    http://www.macosxhints.com/article.p...80130022147512
    http://forum.insanelymac.com/lofiver...hp/t31562.html
    Thanks very much for pointing that out. This turned out to be the issue. I was able to get rid of the flag and now the FAT32 partition mounts nicely in both Leopard and Ubuntu
    Recommended Resources: Ubuntu Linux Resources | Ask Ubuntu

  9. #29
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    Re: How to bypass the 4-partitions limit?

    Quote Originally Posted by Mattventura View Post
    I have found that most of the problems related to the GPT partition table can be solved by going MBR-only. OS X does not need a GPT. From what I remember when I did it, you first blank out the EFI protective partition, then delete it, and you can use the freed 4th partition to make an extended partition (which you can now do if you couldn't previously due to the GPT) and put logical partitions in the extended partition.

    I recommend backing up your MBR before you do this just in case something happens.
    The only problem with that is that OS X will not install on an MBR disk, but there are a few people that run on an MBR disk... especially those that single boot.

    Quote Originally Posted by PartisanEntity View Post
    Thanks very much for pointing that out. This turned out to be the issue. I was able to get rid of the flag and now the FAT32 partition mounts nicely in both Leopard and Ubuntu
    Can you detail what you did? Some users have trouble with this quite often.

  10. #30
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    Re: How to bypass the 4-partitions limit?

    Quote Originally Posted by cyberdork33 View Post
    Can you detail what you did? Some users have trouble with this quite often.
    My method was rather primitive:

    Using the Ubuntu LiveCD launch the partition editor and delete the FAT32 partition.

    Replace it with a resierFS partition.

    Why do we do this:

    a) the partition editor sets no flags on reiserFS partitions it creates
    b) the Disk Utility (which we will need in the next step) in OSX can't edit ext2/3 partitions, neither can it erase a FAT16, FAT32 or NTFS partition that is flagged with MS Reserved.

    Next launch OSX and open Disk Utility.

    Now click on the resierFS partition and select 'erase'.

    Erase the reiserFS partition and replace it with a FAT32 partition (choose the FAT from the drop down menu).

    Disk Utility will create a FAT32 partition without any flags and this new partition will mount nicely in both OSX and Ubuntu.
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