Can someone help me build a HDD power switch please.

I have prepared a schematic but I’m not sure if this is enough to protect the HDD.

Schematic attached.

I’m using latching 2 poles switch which turns on/off both 5V and 12V at the same time.

Capacitors should be 16V 220uF I guess.

Also I’m not sure what kind of diodes should I use ?

Once turned on the HDD starts working and a led light should come on.

Can someone take a look at the schematic please and let me know if it’s correct or needs to be amended ?

Many thanks

 

What is the purpose of the two capacitors?
Remove the capacitors. The way you have drawn the circuit it wouldn't work.

What is the purpose of the diodes?

 

there needs to be some protection for the HDD, that's why the capacitors and diodes.
HDD's are very sensitive to voltage changes.
Please see attached image, a similar product that has capacitors

 

Please see attached image, a similar product that has capacitors

But you can bet your bottom dollar that they are not in series with the power rails. Much more likely that are in parallel with the supplies.

I don't know if this is a problem for an HDD but for many chips it is not advisable to have input signals when there is no power to the chip