JS, it'll depend on the drive and how it respond to faults. I don't believe any recent drives will be able to manage rpm without head and platter to provide feedback.
How about using a DC tach fan? They're cheap, and self cooling. Max RPMs vary by model from 1500-4000. Plenty of controller ICs available.
http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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