Hard Drive Puzzle

Hi

My old HD which I had moved from my old PC to my new PC as master drive has 2
partitions, one for dos and one for linux. The MBR resided on dos.

I installed now a new HD on the new PC and moved the old HD back to the old PC
as master drive. On the linux partition of this old drive I made a new
installation of RedHat 9.0. The dos partition was not touched.

Now to my surprise I cannot boot into dos. If I try I get the error message:
this is not a bootable disk, please insert a bootable floppy.

If I remove this old HD and put it into the new PC as slave drive I can boot
into the dos partition of this old drive.

How does one explain this and how can it be corrected that I can boot into dos
on the old PC?

Thanks & regards
--
Peter

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Re: Hard Drive Puzzle

At 01:39 PM 5/7/2004 +0800, Peter wrote:
>Hi
>
>My old HD which I had moved from my old PC to my new PC as master drive has 2
>partitions, one for dos and one for linux. The MBR resided on dos.

No, the MBR is a set location on the disk, and it resides outside any
partition. Do you mean that you have the drive's boot loader in the DOS
partition instead of in the MBR?


>I installed now a new HD on the new PC and moved the old HD back to the
>old PC
>as master drive. On the linux partition of this old drive I made a new
>installation of RedHat 9.0. The dos partition was not touched.
>
>Now to my surprise I cannot boot into dos. If I try I get the error message:
>this is not a bootable disk, please insert a bootable floppy.

Am I right in thinking that you *can* boot into Red Hat from this disk? How
do you "try" to boot into DOS?

>If I remove this old HD and put it into the new PC as slave drive I can boot
>into the dos partition of this old drive.

Once again, what procedure are you using to "boot into the dos partition"?
Are you adding a stanza to lilo, or entering command-line options at
boottime? Or what?

>How does one explain this and how can it be corrected that I can boot into
>dos
>on the old PC?

Probably you have to modify /etc/lilo.conf so it provides an option to boot
into DOS. But until you describe better what you are doing that works when
the drive is a slave in one machine, but fails when it is the master in a
different one, it will be hard to give you more exact advice.



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