Re: Grub Problem on 2-Disk System

[Jeff Sheinberg]

Barry Skidmore writes:
 > I have Linux (Red Hat 7.2) installed on internal IDE drive 1 (hda) and 
 > Windows XP installed on internal IDE slave drive 4 (hdd).  Below is the 
 > grub.conf file I am using.  However, when I try to boot Windows XP, I 
 > receive an error 21 ("the selected disk can not be found").  Any help 
 > would be appreciated.

Perhaps, your BIOS's idea of which drives are available is
different from your own idea.

Try this, boot up, and when the GRUB menu is displayed, then go
into GRUB command mode, and type the following, where "<TAB>"
means just type the TAB key,

    root (hd<TAB>

then GRUB will print as possible completion alternatives, which
drives it can access through the BIOS, eg,

    hd0 hd1 hd2

Then, for each drive that GRUB knows about, where "<n>" means for
the preceeding output "0", "1", or "2", then type this,

    root (hd<n>,<TAB>

so that GRUB will print as completion alternatives, which
partitions and filesystems it has recognized, eg,

   Possible partitions are:
     Partition num: 0,  Filesystem type is fat, partition type 0x6
     Partition num: 2, [BSD sub-partitions immediately follow]
       BSD Partition num: 'a',  Filesystem type is ffs, partition type 0xa9
       BSD Partition num: 'b',  Filesystem type unknown, partition type 0xa9
       BSD Partition num: 'e',  Filesystem type is fat, partition type 0xa9
       BSD Partition num: 'f',  Filesystem type is ext2fs, partition type 0xa9
       BSD Partition num: 'g',  Filesystem type unknown, partition type 0xa9
       BSD Partition num: 'h',  Filesystem type is ext2fs, partition type 0xa9
       BSD Partition num: 'i',  Filesystem type is ext2fs, partition type 0xa9
       BSD Partition num: 'j',  Filesystem type is ext2fs, partition type 0xa9
       BSD Partition num: 'k',  Filesystem type is ext2fs, partition type 0xa9
     Partition num: 3,  Filesystem type is ext2fs, partition type 0x83
     Partition num: 4,  Filesystem type unknown, partition type 0x82
     Partition num: 5,  Filesystem type is ext2fs, partition type 0x83
     Partition num: 6,  Filesystem type is ext2fs, partition type 0x83
     Partition num: 7,  Filesystem type is ext2fs, partition type 0x83
     Partition num: 8,  Filesystem type is ext2fs, partition type 0x83

Hopefully, after following the above instructions, you will attain
enlightenment regarding the problem you reported.

-- 
Jeff Sheinberg