Hard disk material

Dave McGuire wrote: I'll see if I can unearth some dates/names. I seem to remember a couple of working projects based around non-flying heads and mounting of commercial magtape onto a cylinder for the storage medium. Longevity is obviously questionable, and rotation speed would be rather limited! Will's project is very much in a different league, obviously - hence my interest in how he gets on. To my knowledge, re-coating a non-contact drum running at 'commercial' speeds (what, typically in the 1500-400rpm range?) would be something of a first. Oh, I once read a book describing a homebrew drum in it - I think it was based around using a tin can for the drum, and the capacity was in the tens of bits. (My brain wants to say it was "how to build a working digital computer", but I could be wrong there). I wonder if anyone ever actually built one that worked? :-) cheers Jules