Help with rEFIt being slow, GRUB

**srs5694** · August 23rd, 2010

The message about the partition entries not being in disk order is harmless in and of itself, and it has nothing to do with overlapping partitions. The overlap in your original layout could be seen by the start and end positions of the partitions -- /dev/sda3 ran from cylinder 1 to cylinder 24341, but at least two other partitions (1 and 3) also occupied the same space. That's like two cars trying to occupy the same parking space: Trouble.

Incidentally, using GParted to fix this problem was risky. GParted can handle both MBR disks and GPT disks, but the last I checked, it wasn't very aware of hybrid MBR disks. Thus, there's no telling whether it would change the GPT or the MBR data. It appears you lucked out, but if anybody else reads this, I must emphasize: Use Linux fdisk to delete extra 0xEE partitions! Because Linux fdisk doesn't understand GPT, you can be sure it will operate on the MBR data, not the GPT data.

**chillyperson23** · September 6th, 2010

I used gptsync and an alternate install CD to fix that on mine.

backup whatever you need just in case.

install gparted and delete the small bios_grub partition.

then run
"sudo gptsync /dev/sda" or whatever your drive is.

Then go into OS X and run in terminal,
"sudo gptsync /dev/disk0"
then reboot into the alternate CD and choose "rescue broken system"
Go through all the stuff and choose your root filesystem. (mine was /dev/sda4)
then run

"grub-install /dev/sda --force" and
"update-grub"

It should be fixed and rEFIt should work much faster. If it isnt, try reblessing rEFIt.

Hope this helps you. =]

**kennethsime** · September 8th, 2010

Originally Posted by chillyperson23

I used gptsync and an alternate install CD to fix that on mine.

backup whatever you need just in case.

install gparted and delete the small bios_grub partition.

then run
"sudo gptsync /dev/sda" or whatever your drive is.

Then go into OS X and run in terminal,
"sudo gptsync /dev/disk0"
then reboot into the alternate CD and choose "rescue broken system"
Go through all the stuff and choose your root filesystem. (mine was /dev/sda4)
then run

"grub-install /dev/sda --force" and
"update-grub"

It should be fixed and rEFIt should work much faster. If it isnt, try reblessing rEFIt.

Hope this helps you. =]

I'm sorry, but this thread has gotten very complicated. Which problem did you fix by doing this?

**ipina** · March 12th, 2011

In fact, it seems this is becoming a complicated thread. I got the problem of booting slow with Mac OS X and Ubuntu server 10.04 on an iMac 21" with Intel processor. I had an overlapping issue as well, which I solved following directions as indicated at the beggining of this thread. And I solved the rEFIt slow problem simply by repairing permissions on the MacInthosh volume. Hope this helps someone.