dual booting from two diff. ide hdd not working

tataiermail · 04-26-2007, 10:19 PM

hi all,

i have an IDE CD-ROM ( as /dev/hda)
and in hdb i am having rhel as 4, and in hdc am having win xp.
i know my hdc is having an okward structure, but still i cant configure grub to do dual booting. check out my disk layouts below.
*********************************************
[root@inet ~]# fdisk -l

Disk /dev/hdb: 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/hdb1 * 1 13 104391 83 Linux
/dev/hdb2 1900 4865 23824395 f W95 Ext'd (LBA)
/dev/hdb3 14 1768 14097037+ 83 Linux
/dev/hdb4 1769 1899 1052257+ 82 Linux swap
/dev/hdb5 1900 4852 23719941 7 HPFS/NTFS

Partition table entries are not in disk order

Disk /dev/hdc: 41.1 GB, 41174138880 bytes
255 heads, 63 sectors/track, 5005 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hdc1 2 2550 20474842+ f W95 Ext'd (LBA)
/dev/hdc2 * 2551 5005 19719787+ 7 HPFS/NTFS
/dev/hdc5 2 2550 20474811 b W95 FAT32

Disk /dev/hdd: 20.4 GB, 20490559488 bytes
255 heads, 63 sectors/track, 2491 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hdd1 * 1 2491 20008926 7 HPFS/NTFS
*********************************************************

and here is my current grub.conf:
********************************
#boot=/dev/hdb
default=0
timeout=1
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux AS (2.6.9-22.EL)
root (hd0,0)
kernel /vmlinuz-2.6.9-22.EL ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.9-22.EL.img
title Other
rootnoverify (hd1,4)
chainloader +1
*************************************
currently i am choosing two diff hdd from BIOS to boot into either OS.

any suggestion will be helpful.

regards,

suman

syg00 · 04-26-2007, 11:14 PM

Try

Code:

title Other
rootnoverify (hd1,1)
map (hd0) (hd1)
map (hd1) (hd0)
chainloader +1

tataiermail · 04-28-2007, 11:00 PM

can u explain a bit what does the map command do ?

regards,

syg00 · 05-10-2007, 03:30 PM

Windoze requires it be installed on the disk the BIOS selects as the boot disk.
The maps merely make it appear (to 'doze) it is located on the first disk.

Doesn't affect anything else.