On Tue, Sep 21, 2010 at 09:42:14PM +0200, Svante Signell wrote: > Yes, if I remember correctly, that's what I did some time ago, when > installing a new disk for /home. > > > If so, then there is a chance that the first sector of sda3 contains > > the old extended partition table, and grub probe might be detecting that. > > > > One way to check would be to do: > > > > dd if=/dev/sda3 of=/tmp/sda3.mbr bs=512 count=1 > > > > Then run 'file /tmp/sda3.mbr'. If it says partition table, then I think > > you have found your problem. > > Yes, you are right: > # file /tmp/sda3.mbr > /tmp/sda3.mbr: x86 boot sector; GRand Unified Bootloader, stage1 version > 0x3, 1st sector stage2 0xdd29b38; partition 1: ID=0x83, starthead 239, > startsector 63, 35153937 sectors, extended partition table (last)\011, > code offset 0x48 > > # fdisk -lu /dev/sda > > Disk /dev/sda: 160.0 GB, 160041885696 bytes > 240 heads, 63 sectors/track, 20673 cylinders, total 312581808 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0xd568d568 > > Device Boot Start End Blocks Id System > /dev/sda1 63 7575119 3787528+ 1b Hidden W95 FAT32 > /dev/sda2 * 7575120 230640479 111532680 7 HPFS/NTFS > /dev/sda3 230640480 234541439 1950480 83 Linux > /dev/sda4 234541440 312575759 39017160 f W95 Ext'd (LBA) > /dev/sda5 234541503 240861599 3160048+ 83 Linux > /dev/sda6 240861663 261878399 10508368+ 83 Linux > /dev/sda7 261878463 310413599 24267568+ 83 Linux > /dev/sda8 310413663 312575759 1081048+ 82 Linux swap/Solaris > > > If that is what is happening, then it is a question of whether grub-probe > > made a mistake when it scanned for partitions in something not marked > > as a valid place to look for partitions. Of course the quick workaround > > in that case is to clear that sector (assuming the filesystem doesn't > > use the first sector of the partition, which many filesystems avoid > > since it is a handy place for boot loaders and such). > > You are the Grub developers, you can tell if Grub does the right thing.
I am just a user. > > If the filesystem does avoid that part of the partition, that would be a > > good reason an old extended partition table would have survived creating > > a filesystem. > > So the solution is to blank out the first sector of /dev/sda3, > > dd if=/dev/null of=/tmp/sda3 bs=512 count=1 > > to get rid of the warnings? Please confirm the command above is correct. Not quite. dd if=/dev/zero of=/tmp/sda3 bs=512 count=1 That should work. /dev/null is for output. You need input and a source of all zeros. Probably want to save the original you dumped before on some other media just in case you need to restore it (although I highly doubt it). -- Len Sorensen _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
