FYI, I tried to PM this to staple's maxtor 5400 rpm 80 gig drive. After the Staples rep talked to the rep from compusa, she told me they had different manufacturer's part numbers. Compusa told the Staples rep that Stapels had the older discontinued model (that contained letters and numbers), while the Compusa version was the newer drive (contained about 8 or so just numbers, mostly 0's). This seems to confirm for me, Compusa is selling the Quantum made drives, while the older drives are Maxtor made.
Sorry for the hard reading, but I thought it would be interesting to add.