Only thing I can think of would be passwords saved by my browser, but thats not saved plain text. But my old hard drives only go to family and by the time they get rid of it they've been using it years so never had worries.
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I usually get an External Case off of Newegg or Tigerdirect and keep them as Picture/Music/Backup drives. I've got about 3 older 250-500 gig external drives now doing this and its worked out pretty well.
Edit* Oh and anime... lots and lots of anime.