Error 21: Selected disk does not exist

**satimis** · 08-04-2005

Hi folks,

LFS 6,1
FC3 Host

Encountered another problem on the same section.
8.4. Making the LFS System Bootable
http://www.linuxfromscratch.org/lfs/...er08/grub.html

.... run the grub shell

root:/sources/linux-2.6.11.12# grub

Code:

grub> root &#40;hd0,5&#41;
Error 21&#58; Selected disk does not exist

Tried only typing;
grub> root (hd

and pressed <Tab>. Nothing popup.

root:/sources# cat /etc/fstab

Code:

# Begin /etc/fstab

# file system  mount-point  type   options              dump  fsck
#                                                             order

/dev/hda6      /            ext3   defaults             1     1
/dev/hda3      swap         swap   pri=1                0     0
proc           /proc        proc   defaults             0     0
sysfs          /sys         sysfs  defaults             0     0
devpts         /dev/pts     devpts gid=4,mode=620       0     0
shm            /dev/shm     tmpfs  defaults             0     0
/dev/fd0       /mnt/floppy  auto   noauto,owner,kudzu   0     0
# End /etc/fstab

As FC3 Host

[root@localhost ~]# fdisk -l /dev/hda

Code:

Disk /dev/hda&#58; 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1          13      104391   83  Linux
/dev/hda2              14        2563    20482875   83  Linux
/dev/hda3            2564        2690     1020127+  82  Linux swap
/dev/hda4            2691        4865    17470687+   5  Extended
/dev/hda5            2691        3907     9775521   83  Linux
/dev/hda6            3908        4637     5863693+  83  Linux
/dev/hda7            4638        4865     1831378+  83  Linux

[root@localhost ~]# df -hT

Code:

Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/hda2     ext3     20G  9.2G  9.2G  51% /
/dev/hda1     ext3     99M   12M   83M  12% /boot
none         tmpfs    125M     0  125M   0% /dev/shm
/dev/hda5     ext3    9.2G  1.7G  7.1G  20% /home
/dev/hda6     ext3    5.6G  2.4G  2.9G  45% /mnt/lfs

Please advise. TIA

B.R.
satimis

**Nerderello** · 08-08-2005

the only question I can think of is - do you have only the one hard disk? As in, do you only have a /dev/hda - (hd0) ? Becuase your grub command - root (hd0,5) - should find /dev/hda6 .

Nerderello

**satimis** · 08-08-2005

Hi Nerderello,

the only question I can think of is - do you have only the one hard disk?

Yes. The HD is connected as primary IDE master, no SLAVE attached to the same IDE cable.

As in, do you only have a /dev/hda - (hd0) ?

Sorry I don't follow. Please explain. Tks.

B.R.
satimis

**budman7** · 08-08-2005

You could try Nerderello's grub tutorial
And try "find /boot/grub/stage1"
If it is on hd0,5, do

root (hd0,5) ENTER

**Nerderello** · 08-09-2005

Satimis,
my second question was really just a different way of asking the first question. You answered it - with a yes.

/dev/hda is a way of saying the entire first IDE device (hard disk), and (hd0) is grubs way of refering to the same device.

See if the tutorial (see post above) helps any.

good luck

Nerderello

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