I've got a Western Digital WD3200AAJS HDD and am trying to spin it up (I don't really need it as an HDD, I need just its motor to work).
After connecting the power cord it didn't spin up, so I am in doubt whether it is dead or it just needs to receive something through SATA connector.
For comparison: a Samsung HD401LJ disk spins up with only power connected.
I tried to find l7251 3.1 datasheet to find SPNENAB pin, but didn't find any datasheet.
Probably you could leave a link to resource where simple HDD motor driver (instead of dead one) is described. I do not really care at which speed exactly it will spin if the speed is stable.