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Old 07-06-2009, 09:50 AM   #1
LQ Newbie
Registered: Jul 2009
Distribution: Slackware
Posts: 2

Rep: Reputation: 0
Strange partition in Fakeraid system after installing windows 7

Hi all

I had Slack, Ubuntu and WinXp running like a charm in a Fakeraid system in RAID0. Then I installed Win7 upon the Xp partition (deleting and formating the partition before). During the setup, Win7 asked me to create a new partition for system files, and I accepted.

As usual after an Windows installation, I got to fix Grub, but there're some strange behaviours, which I think are related, that didn't happen before.

Booting up by an Ubuntu LiveCD, I installed dmraid package, set the system folders and chroot'ed into the partition that have Grub. But when I run it, first I got the message "Unknown partition table signature" and then I cannot set the boot partition to (hd0,8), what give me "Error 18: Selected cylinder exceeds maximum supported by BIOS".

I thought this could be a partition table corruption and ran fdisk. I got this:

root@ubuntu:/# fdisk /dev/mapper/nvidia_ccfgcbbe

The number of cylinders for this disk is set to 19458.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/mapper/nvidia_ccfgcbbe: 160.0 GB, 160052674560 bytes
255 heads, 63 sectors/track, 19458 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x82298229

                      Device Boot      Start         End      Blocks   Id  System
/dev/mapper/nvidia_ccfgcbbe1   *           1          13      102400    7  HPFS/NTFS
Partition 1 does not end on cylinder boundary.
/dev/mapper/nvidia_ccfgcbbe2              13        5099    40853504    7  HPFS/NTFS
/dev/mapper/nvidia_ccfgcbbe3            5100       19457   115330635    f  W95 Ext'd (LBA)
/dev/mapper/nvidia_ccfgcbbe5            5100       10198    40957686    7  HPFS/NTFS
/dev/mapper/nvidia_ccfgcbbe6           10199       15297    40957686    7  HPFS/NTFS
/dev/mapper/nvidia_ccfgcbbe7           15298       16548    10048626   83  Linux
/dev/mapper/nvidia_ccfgcbbe8           16549       17799    10048626   83  Linux
/dev/mapper/nvidia_ccfgcbbe9           17800       19050    10048626   83  Linux
/dev/mapper/nvidia_ccfgcbbe10          19051       19457     3269196   82  Linux swap / Solaris
The partitions are arranged as follows:
/dev/mapper/nvidia_ccfgcbbe1   -> partition created by the Win installer
/dev/mapper/nvidia_ccfgcbbe2   -> actual Win partition
/dev/mapper/nvidia_ccfgcbbe3   -> Read below
/dev/mapper/nvidia_ccfgcbbe5   -> Data partition 1
/dev/mapper/nvidia_ccfgcbbe6   -> Data partition 2
/dev/mapper/nvidia_ccfgcbbe7   -> ~
/dev/mapper/nvidia_ccfgcbbe8   -> Slack partition
/dev/mapper/nvidia_ccfgcbbe9   -> Ubuntu partition
/dev/mapper/nvidia_ccfgcbbe10  -> swap
As you can see, "nvidia_ccfgcbbe3" covers all partitions but the 2 firsts, although it doesn't exist in /dev/mapper and fdisk never had showed it before:

root@ubuntu:/# ls /dev/mapper/
control		   nvidia_ccfgcbbe2  nvidia_ccfgcbbe8
nvidia_ccfgcbbe    nvidia_ccfgcbbe5  nvidia_ccfgcbbe9
nvidia_ccfgcbbe1   nvidia_ccfgcbbe6
nvidia_ccfgcbbe10  nvidia_ccfgcbbe7
If I try to exclude it with fdisk, it deletes all the partitions it bounds. Do anyone know some clue to fix this?
Thanks in advance
Old 07-07-2009, 09:38 PM   #2
LQ Newbie
Registered: Jul 2009
Distribution: Slackware
Posts: 2

Original Poster
Rep: Reputation: 0
Good, I got it. It seems that the extended partition is showing itself now. I do not remember had seen it before in fdisk output. Anyway, I just wrote the partition table with TestDisk without changes and that solved Grub issues.



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