Intel Mail Station, I think thats what it was called. It came out about 4 years ago or so but I dont think they sell it now. Same size of todays newtwork router but thin. National 486 embedded CPU with a 3.5" HD, runs off of wall wart.
Search for "byod nas", that's "bring your own disk network attached storage", and you'll find products like the D-link DSM-G600, a box with some firmware following...
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