What tomlee59 said above. I opened a 40MB one, planted it in a Quadra 605, and installed 7.1 just to watch it working away. A full OS install and some app installs later, I put the lid back on, and left the drive - it still worked OK a few years later.
I have no idea how careful you'd need to be with the heads, or removing platters - that's something I've not done - but as far as simply exposing platters to the elements, for a drive that age & size it worked for me.
Dana
