I have bought this cable in order to use a separate USB adapter to power my desktop hard disk (3,5")


At one end is a normal USB male connector, and on the other end is an adapted 15-pin plug. These are the connected pins, I believe. Which I think they are correct pinned

SATA pinout

Should I connect anything else to turn the hard disk on? Or should this be enough? Am I doing anything wrong?

There are many cables like the one in the image below, but what I want is to manage the data cable be independent from the power cable. Is that possible? I was looking for a cable 7-pin SATA male to USB male but I couldn't find any. I want to connect the disk to a Raspberry and use a different power adapter to make it work.

data and power cable together

Any suggestion would be appreciated.

  • a) This is not a hardware request, & would be a better fit for superuser.com b) You didn't tell us what HDD you're trying to power.
    – Tetsujin
    Commented Sep 26, 2021 at 19:10
  • Thanks for your comment @tetsujin. I'm trying to power this guy. Actually I'm looking for a hardware recommendation because actually my configuration is not working correctly. How can make this work?
    – ChesuCR
    Commented Sep 27, 2021 at 9:41
  • 1
    It says on the product link and the picture you posted that it will not work on 3.5" drives, because USB doesn't have a 12V rail. You need a dock with its own power supply.
    – Tetsujin
    Commented Sep 27, 2021 at 10:14
  • Aaah you are right @tetsujin, I'm kind of blind haha. I thought it would work because I have a Qualcomm Quick Charger with 12V, that uses USB cable. So I don't know why they say that USB does not have 12V rail ¿? Thin, I would go for something like this with and adapter molex-SATA. Let's see if I don't blunder again
    – ChesuCR
    Commented Sep 27, 2021 at 12:57
  • 1
    It's your Qualcomm… & your right to test if the magic smoke leaks out when you try that ;)
    – Tetsujin
    Commented Sep 27, 2021 at 13:15

2 Answers 2


That device won't work on 3.5" HDD drives because USB-A doesn't have the 12v rail those drives need.
USB-C has various ways of delivering higher power, but not USB-A.

The solution is an external power supply or something with USB-C with a PD specification.


This is the only one I found, and its for old SATA and is from a dutch shop: https://www.dennisdeal.com/products/usb-2-0-naar-sata-ide-data-hard-drive-cable-voor-hdd-power-converter-adapter_1105778

  • Thanks for answering. As Tetsujin said in the comments I can't use that cable in my question with desktop hard disks. That was my mistake :/
    – ChesuCR
    Commented Sep 27, 2021 at 12:59
  • Anyway I will need something similar to your suggestion to send just only the data through USB. I wonder why it is not very popular that kind of cable
    – ChesuCR
    Commented Sep 27, 2021 at 13:11
  • I found this one cheaper
    – ChesuCR
    Commented Sep 27, 2021 at 13:41

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