Funny story.
Had someone ship me a hard drive in unknown condition, Kalok Octagon KL-330, 30MB ST412 RLL.
Tried to get it to go, no spin. Cracked open the lid thinking it was junk, I'd use it as a decoration somewhere. Noticed that the heads were out in the middle of the data area...head crash almost certainly.
Figured...eh...why not. Cabled it up again, powered it on, and it spun up...and worked. The ever-so-slight jarring action of getting the lid open unstuck it.
Working capacity is 19MB though, from assorted platter damage.