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Wyoming | That looks like a platter from one of IBM's drives of the early/mid 80s, possibly a 3350 or 3380. They were good, solid disk storage units, about the size of two refridgerator units side-by-side.
Here's a pic:
http://www-03.ibm.com/ibm/history/exhibits/storage/storage_3380.html
IBM has quietly led the way in storage technology since they invented the disk drive, then they invented the "Winchester" disk drive (nicknamed "Winchester" because the model name was "3030), then they were off into new head designs, new media coatings, etc, etc. IBM knows their stuff about magnetic storage, disks especially so.
Those 3380's were a) biiiiig for their time and b) fast. Oh-so-wicked-fast. Of course, having the disk on the System 370 channel attach IO path helped, but there was no gettin' around the facts: while every other computer manufacture other than CDC and Cray were poking along with small, slow disks, IBM was putting out huge disk storage that was smokin' fast.
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HD turns 50
