A 4TB WD My Passport, dropped from a desk and beeping
The heads had stuck to the platter on impact, and the owner unplugged it and left it alone, which is why the platters were unmarked. Heads freed and replaced on the clean bench, the drive brought up through its own board so that its encryption key could be used, and imaged head by head over four nights. The photographs since 2014 came back complete.
Illustrative example — replace with a genuine case