not sure about IDE pinouts but maybe wrong voltages applied to the wrong pins and killed it.
anyway, it looks your problem is that the drive is not identified correctly in the bios. BIOS communicates with the little firmware ROM on the drive (no matter what type of drive it is) and gets the drive information from there.?
also these scopes (unlike some other scopes specially tektronix ones) can be easily booted to just pure windows 98 with no scope software in it
I mean if you just make a bootable windows 98 DOS floppy (available on internet) or a windoows 98 installation CD you should be able to boot the scope
from there and check your drive or even burn the image to it from within the scope.
