oh!
on standard ide it matters that master is on the end ... and slave is in the middle ....of the ribbon
if they have worked together though .....
only other things I can think of
cable faulty
bios not autodetecting two discs (I've seen it before ... 1 fine 2 goes to pot! - but only twice in 15 years)
Power unit faulty ... can't supply enough current for 2 hdds.
other that that nothing comes to mind - other that 3Gb!!!!!
don't think I've ever seen one before ....
If 40 works ... is it worth the effort for only 3Gb?