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grub dual boot, dual drives...

Trying to dual boot with two drives, bios is set to boot to scsi first, hence I'm using grub as my boot loader. Problem is when trying to boot windows, after chanloader +1, the system hangs..

/dev/hda = Windows
/dev/sda = CentOS 4

Code:

fdisk /dev/hda -l

Disk /dev/hda: 20.8 GB, 20847697920 bytes

255 heads, 63 sectors/track, 2534 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes



  Device Boot      Start        End      Blocks  Id  System

/dev/hda1  *          1        892    7164958+  7  HPFS/NTFS

/dev/hda2            893        2534    13189365    7  HPFS/NTFS



fdisk /dev/sda -l



Disk /dev/sda: 4512 MB, 4512701440 bytes

255 heads, 63 sectors/track, 548 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes



  Device Boot      Start        End      Blocks  Id  System

/dev/sda1  *          1          13      104391  83  Linux

/dev/sda2              14        548    4297387+  8e  Linux LVM

And here is my grub.conf

Code:

default=2

timeout=10

splashimage=(hd0,0)/grub/splash.xpm.gz

title CentOS 4.0 (2.6.9-5.0.3.EL)

        root (hd0,0)

        kernel /vmlinuz-2.6.9-5.0.3.EL ro root=/dev/VolGroup00/LogVol00

        initrd /initrd-2.6.9-5.0.3.EL.img

title Windows XP

        rootnoverify (hd1,0)

        chainloader +1

Hi!
Problem is your "root" device is wrong. It probably should be sda0,0 That is supposed to be your Linux root device (your main linux file system, not your swap or home or?) where your menu.lst and devicemap are, not where your windoughs drive is. Hope this helps. I've made this mistake too in grub, so if that is the problem don't feel bad.

According to your grub.conf, windows is installed on the second hard drive ((hd1,0) = (hdb,1)).
But, elsewhere in your post, you indicate that windows in on /dev/hda.
If windows is in fact on /dev/hda, then edit grub.conf to correctly reflect that situation ((hd0,0) = (hda,1)).

((hd0,0) = (hda,1)).

I think thats my issue.. but if root (hd0,0) is wrong, why is it my linux boots okay.

I think I'm confused with grubs device naming convention..

(hd1,0) is not the same as (hda,1)?

Quote:

(hd1,0) is not the same as (hda,1)?

No, it isn't. hd1 already means hdb actually. Take a look here: http://www.gnu.org/software/grub/man...g%20convention for Grub namings conventions.

Ah ha! Thanks for the link Harken!

Got it, heres what I had to do:

Code:

title Windows XP

        map (hd0) (hd1)

        map (hd1) (hd0)

        rootnoverify (hd1,0)

        chainloader +1

Works like a charm.

cp /etc/grub.conf grub.backup.and.dont.forget