Here is a working, tested 50-pin 1.04GB SCSI-2 hard drive made by Quantum for DEC in the early 1990s. It uses four 3.5" platters spinning at 5400 RPM with a 512KB cache.
The drive you will receive is has been tested successfully in a Windows 7 system with an Adaptec 29320A SCSI host adapter. It was recognized immediately. I used the Adaptec to perform a new low level format and verify the drive. I created a single FAT32 partition formatted it. It has 999MB (strictly speaking) or 1.04 billion bytes of usable space. I also ran HD Tune under WIndows 7 to verify that there are no bad sectors.
Buyer will receive the exact drive pictured here (or an identical one), but nothing else.
I offer a 30 day return privilege and free ground shipping to any U.S. zip code.