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Old 07-16-2004, 11:04 AM   #1
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Registered: Jul 2004
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FC2 MBR Fix issues -- strange sfdisk output

I started with a working WinXP box with the following configuration:

c: 30gb WD physical disk (/dev/hda) - FAT32 partition
d: 80gb Maxtor physical disk (/dev/hdb) - NTFS boot partition

I read the advisory regarding FC2/Windows dualboot issues, so loaded up FC2 rescue and used fdisk -l /dev/hda to get the following info: 3739 cyl, 255 heads, 63 sectors.

I then started the FC2 install with the command >linux hda=3739,255,63 as per the advisory.

using FC2 installer, I deleted the FAT32 partition on c: and created a 1024 mb swap and filled the rest of the space with an ext2 linux partition. Install reported a problem with hdd geometry but I went ahead anyway, thinking my initial command had things covered. FC2 install finished alright, booted. I had to edit rc.sysinit to get my 3c905A NIC working, but that shouldn't matter. I rebooted, chose "other" at the GRUB prompt, and got the infamous error.

Next, I tried the sfdisk fix as documented in the advisory. Here's the output from my first stage. There were no warnings, so this is unedited:
# partition table of /dev/hda
unit: sectors

/dev/hda1 : start=       63, size= 57962457, Id=83, bootable
/dev/hda2 : start= 57962520, size=  2104515, Id=82
/dev/hda3 : start=        0, size=        0, Id= 0
/dev/hda4 : start=        0, size=        0, Id= 0
and this is what happened at the second step:
cat MyPartitionTable.txt | sfdisk --no-reread -H255 /dev/hdaWarning: HDIO_GETGEO says that there are 16 heads
Disk /dev/hda: 59598 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hda1   *      0+   3607    3608-  28981228+  83  Linux
/dev/hda2       3608    3738     131    1052257+  82  Linux swap
/dev/hda3          0       -       0          0    0  Empty
/dev/hda4          0       -       0          0    0  Empty
New situation:
Units = sectors of 512 bytes, counting from 0
   Device Boot    Start       End   #sectors  Id  System
/dev/hda1   *        63  57962519   57962457  83  Linux
/dev/hda2      57962520  60067034    2104515  82  Linux swap
/dev/hda3             0         -          0   0  Empty
/dev/hda4             0         -          0   0  Empty
Successfully wrote the new partition table
Re-reading the partition table ...
BLKRRPART: Device or resource busy
The command to re-read the partition table failed
Reboot your system now, before using mkfs
If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
What strikes me as odd is the fact that its trying to re-read the partition table despite --no-reread being specified at the commandline.

Anybody have any thoughts?


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