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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