I really have only a guess on rpms and that would be maybe 5000 - these are used drives from '96 '97 '98 and came out of office's or school systems. The brands are Western Digital, Fujitsu, Maxtor, and Quantum. There might be a few Seagates - I saw one of them running a blade when I went down to check your question. I went crazy trying to find small hard drives when I first started folding and that is why I have extras - I was paying 19 bucks each for 1.3? gigs. Jack
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