Adding a fan to a USB to SATA adapter?

[Peter1986C]

I am having an "old" 250 GB WD disk that I am currently using as an external HDD by means of an adapter (USB 3.0 to SATA III). The problem though is that the HDD runs a little hot so I wish to know whether it is possible to power a fan via the same adapter, e.g. by using a 15-pins SATA (power) to 4-pin Molex adapter and attaching a Molex to 3-pins KK to it for the fan.

I drew a simple schematic to picture it:

The only cable I still need is a Molex to 15-pins SATA female adapter (for connection with the USB/SATA adapter), so the other cables are already in my possesion. Would this work? Molex, 15-pins SATA and casefans support 12v but what voltage does the HDD use (relevant, because of the 4-pin Molex to 15-pin SATA between the rest and the HDD itself)?

Thanks in advance.

 

[Deleted member 3]

Not getting your schematic.

3.5" disks use both 12 and 5v as far as I know, 2.5" work with 5v. Since your disk runs hot I'm assuming it's a 3.5" disk. Red is +5, yellow is +12, black is ground. Connect the wires of your fa to wires with the same colors and you're fine. If you feel the need you can feed different voltages to your fan for performance or noise reasons.

 

[Peter1986C]

I think I will try that.

Edit: I just realise that I can not connect the wires to the USB-SATA adapter that way (unless I open up that adapter but I may "kill" it), so I think I am ending up in buying a 15p SATA male (not female, that was a mistake of mine) to 4p Molex male cable anyway. Your information has made me pretty sure that that will work (as stated before, the wiring for the fan and for a "revert" back to 15p SATA female (for the HDD) are plentily available to me already because I somewhat hoarded them.