Seagate Stop/Start Spin by board?

[_root]

Hi guys,

I have Seagate DKS5C-K300SS, I wanna know is it possible to send a signal or any action to stop or start disk spin?
for example, making a connection between one of the screws and one of the holes?
here picture form the board:

Front:



Back:

Attachments

[fzabkar]

SATA power pin #11 controls initial spin-up. I don't know what kind of control you have after spin-up, though.

[pepe]

i guess there are quite a few combinations that would stop the drive spinning, however, not all of these are reversible
joke apart, i doubt there is such a pin, it would imply the firmware polls that pin and arrange for shutting down everything in a controlled manner. I can't see why the manufacturer would implement such way once there are sw methods to achieve the same.

pepe

[fzabkar]

@_root, if you can identify the markings on all the smaller ICs, I could at least try to understand how they work and whether disabling any of them might trigger a controlled spin down. I doubt it, though.

[Tomset]

Useless.
Only software can control the motor.
for example, although an old microcircuit was used on maхstors and samsungs.
But you can understand how it is managed.
2.7 Startup Algorithm Description
http://www.rom.by/files/L7250E.pdf

[fzabkar]

I'm wondering about the function of the IC between the 3R3 and R47 coils. AFAICT, it is either controlled by, or reports to, the motor controller. If there is an open drain Power_OK signal, then perhaps this could be externally controlled.

[pepe]

that IC is a DC-DC converter together with 3R3 coil, the current sense resistor above it and the caps to the right. I have no idea which voltage it is responsible for (cannot be a negative one by the layout), but i have doubts the fw would tolerate such intervention. I mean it probably goes into a state from where it does not simply come back once the change is undone.

pepe