My least favorite disk drive noise is "skrch!" Think Seagate.
(and no, I don't mean they're all bad. I've got two Medalist 1080's here
that have been running essentially 24/7 for two-plus years, and they're
fine. But when you get a bad Seagate it goes "skrch!" and you throw it
away, and I know from lugubrious experience that you're not going to get
the data back off it just by wrapping it in plastic and sticking it in the
freezer overnight.)
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Kip Crosby engine(a)chac.org
http://www.chac.org/index.html
Computer History Association of California