Only ONE LEFT of these Western Digital Caviar internal ATA (also called PATA) drives with fast 7200rpm speed and Enhanced IDE (EIDI) cabling. All had light home office use, have been stored unused since 2007, and are in excellent condition. Current formatting is easily changed to Mac, Unix or whatever.
One 160gb -- $20
-- model WD1600JB-32EVA0 (Windows NTFS)
If you're unsure of what you need, the 2nd photo above shows how the plug-in area of these IDE/ATA/PATA drives differ from a SATA drive.
I'm open to reasonable offers.