I've searched and read several threads about problems similar to mine but have not found the same exact circumstance. So I apologize up front if this information could have been found with a more thorough search. I have an older Gateway Desktop computer I am trying to retrieve the data from the hard disk. The computer died on me before I could save my data. I had two hard drives in this computer so I ordered two external enclosures thinking I would be able to get the data. The newest hard drive Maxtor 160 gig, worked in the enclosure but the original hard drive, an IBM 20 gig, did not totally work for me. (Operating System Windows XP Professional) When I look into My Computer/System Properties/Hardware/Device Manager/Disk Drives, the IBM hard drive appears there. But I have no drive letter assigned to the IBM drive when looking for it in Windows Explorer or My Computer/Hard Disk Drives. It does not show up there, therefore I cannot get my data. The Maxtor shows up at this location when I have it plugged into USB but the IBM does not. I recall when I installed the Maxtor into the system I also installed some kind of upgrade card that would run the Maxtor because it was a faster speed "something or other." The numbers that come to mind are 66/100/133. I can't remember what this was technically but some of you may recognize and know what I mean. Seems like the original hard drive (IBM) was "66" whatever the term is, and the new one (Maxtor) was "100" or "133" whatever the technical term is. I don't know if this makes any difference or not as far as Windows XP Professional assigning a drive number. Can anyone give me help on how to obtain a drive letter for this older IBM drive without reformatting it or repartitioning it. I'll lose my data as I understand it if I perform these functions.