Ubuntu Installation :: The Incredible Shrinking Extended Partition

Oct 26, 2010

I have been attempting to set up a bunch of partitions on a bunch of hard disks, in preparation for installing Maverick. I will be setting up a number of RAID partitions, so I will install from the alternate disk (ubuntu-10.10-alternate-amd64.iso). Now ever since they added support for GRUB2 and a new partition type and align-to-megabyte and a whole bunch of other goodness, partitioning has been buggy. This has been true for Maverick and Lucid. Even the 10.04.1 version (an Ubuntu LTS!) still has problems. Every time I try something else, some other bizarre bug rears its ugly head. (Yes, I have been reporting them on Launchpad when I find a new one.)

In order to move forward on this project, I have been using a variety of partitioning tools. I temporarily installed Maverick on a small partition, and have used Disk Utility (palimpsest) and GParted while booted into that. Occasionally when things get really strange I boot up the latest version of System Rescue Disk, which contains the latest version of gparted. I use these various tools to try out various partitioning schemes, just laying out empty partitions that will be formatted or assembled into RAID arrays later. When I get all the desired partitions set up, I will boot into the alternate installer and do the final installation. (I don't want to do the entire thing within the alternate installer because it makes my head hurt. I do have a lot of partitions.) This has been going on for weeks now. Every time I try something different, something weird happens, and I have to try various workarounds, or switch to different tools. Basically, my partitions eventually become unstable.

Here's the latest mind boggler: Disk Utility displays nice graphical maps of your partitions. This image includes before and after screenshots showing what happens to my partitions occasionally. We start with three primary partitions and one extended partition. The extended partition goes all the way to the end of the disk. We put a small logical partition into the extended partition, at the beginning of it. We can then click on the "free" portion of the extended partition and create additional logical partitions if we like.

Afterwards, the extended partition has magically shrunk itself down until it is the same size as the small logical partition it contains. The free space has migrated out of the extended partition, and is now useless, as you can't have more than four primary+extended partitions. Disk Utility won't let you create another partition. What happened between the Before and After pictures? I don't know. I do know that I did not ever tell any tool to change the size of any partition. Moving or resizing partitions can trigger various known bugs, so I never even try to do that, I just delete partitions and start over.

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Ubuntu :: Shrinking An Extended Partition?

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I recently decided to resize a partition on my HDD (partition on which Ubuntu was previously installed).This was in order to remove Ubuntu from one of my HDD. I got rid of the Grub loader by booting on my windows system recovery disk and using Bootrec.exe/FixMbr and my computer now boots directly into windows. I then deleted the Ubuntu partition.

To get to the heart of the problem, I am trying to move the free space that is in the extended partition out and merge it with C. I tried doing this with my Gparted liveCD but it didn't work. I didnt have anything to save the error message onto, but I will try the process again when I get home and save the error onto my external drive so that I can post it here.

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[code]....

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fdisk -l
Device Boot Start End Blocks Id System
/dev/sda1 * 1 3969 31880961 7 HPFS/NTFS
/dev/sda2 3970 5294 10643062+ 83 Linux

[code]...

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Some outputs
Code: # df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 5201536 5173904 0 100% /
tmpfs 1023464 0 1023464 0% /lib/init/rw
udev 10240 2672 7568 27% /dev
tmpfs 1023464 0 1023464 0% /dev/shm
/dev/sda2 478812280 10336484 444345032 3% /var
overflow 1024 4 1020 1% /tmp

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GNU Parted 2.3
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: ATA ST3500418AS (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 512B 5369MB 5369MB primary ext3 boot
2 5369MB 500GB 494GB primary ext3
3 500GB 500GB 538MB primary linux-swap(v1)

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[URL]

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I've got a windows partition with a lot of free space followed by an extended partition. The extended partition has three sub-partitions: grub/boot&everything else, home, swap.

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