Like the 70s video diskThey all make it sound so mystical and sci-fi like. While the mechanics of a regular mechanical hard disk blow all that out of the water - and let's not even start about the rather fascinating structures of run-off-the-mill MEMS devices...
"[...] using a layered disc that contained a thin layer of metal coating a vinyl disc, and covered in a lubricant to smooth out the stylus’ ride along the tiny grooves. The stylus, which was so small and fine that it eventually had to be made from slivers of diamond"
If you could make a regular mechanical hard drive into some sort of analog audio storage, it'd technically be one of the best and high quality analog formats available. I'm not sure it'd be feasible like that, but from a pure physics and electronics standpoint, it'd be probably the best analog format ever.