The ST506 80MB MFM hard drive. For comparison, the black circle in the center could fit a 256GB microSD card within its bounds, a medium that stores 3000x more data than the drive under it.
And for comparison, the Radio Shack "5 Megabyte Disk System". Yes this is a hard drive. Yes it was made in the 70s. It retailed for $4000 70's dollars. It was about the same size but a little shorter than a desktop MicroATX PC. The write protect is the KEY on the right. It was about the same size of 4 of those ST506's previously posted set 2x2 on the desk.
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