Hi, > it powers up, gets > re-detected by the system, gets auto-mounted, and starts spinning once > again.
Typically a device spins up when it gets a command from the computer
which needs spinning. E.g. when some data reading is requested.
Maybe you get an idea of the offending process by
btrace /dev/sdd
The texts in []-brackets tell the process name.
E.g. this is caused by dd reading from disk:
8,48 7 1 0.000000000 29579 G N [dd]
Have a nice day :)
Thomas
