Recently one of my comps stopped working, on which I had all my music.

I decided to put one of the drives in another computer so I could listen to all my tracks while I sort the other comp.

After slotting it in and sorting out all the jumper settings, I tried to boot up. It flashed up 'MBR Error 3' before booting normally.

When in windows, I tried to access it, but it only registered one drive (it has two partitions) and also said it wasn't formatted. I restarted, but it still did the same message.

How do I get it to work?

Mobo specs:
Board: ASUSTeK Computer INC. A7A266 REV 1.xx
BIOS: Award Software, Inc. ASUS A7A266 ACPI BIOS Revision 1004 04/30/2001

P.S. when I put the other drive back in, I had the same problem again.