I'll try to answer all the replies here
First of all the disk is a storage disk and works just fine with an alternate system disk on the same machine, with the same configuration.
Probably I can run chkdsk on it in the alternate configuration now, in the original config. the disk is seen as RAW, chkdsk does not run on RAW disks
It is visible in the BIOS, should have mentioned on a Promise 133 controller card, but the same on the alt. system disk w/ same O/S.
No cabling / jumper issues anticipated
Boot Sector issues ??? must be specific to single O/S installation and not the other. BTW, the disk partition was not formatted as a primary partition.
CMOS issues, ??? not expecting that either
BTW where does one find "Boot device Listing" in Win ?
Thanks guys!