How to connect 3.5in HDD to eSATA port on laptop without enclosure or dock?

I have a WD7500AACS 3.5in HDD, that I'd like to connect to my laptop's eSATA port. HDD's connectors look exactly like the ones on this 3.5 HDD in this picture (the bottom one). I do not want to buy an enclosure or a dock, because they are expensive compared to cables, and I do not need portability or any other benefits they might offer; this drive is just for backup and I don't expect to spin it up more than once a month.

As I understand, I need a female SATA to male eSATA cable, and a 12v power adapter. I can find SATA-eSATA cables, but I'm having a hard time finding any power adapters. I was surprised that information on what power adapter to buy is sparse on the internet. What power adapter should I buy?

Also a concern I have is that if I buy separate power adapter and SATA-eSATA cables they both might not fit on the HDD's SATA connector. Is that a reasonable concern?

Any insight, advice or guidance would be appreciated.
6 answers Last reply
More about connect 5in hdd esata port laptop enclosure dock
  1. Hi, you have no choice, you will have to buy an enclosure or a dock, even if you find a cable for the 12v and 5v, where the cable will be connected to receive the voltages? Laptops don't have the 12v required, you will need a power source for the voltages (enclosure or dock).
  2. jarotech said:
    Hi, you have no choice, you will have to buy an enclosure or a dock, even if you find a cable for the 12v and 5v, where the cable will be connected to receive the voltages? Laptops don't have the 12v required, you will need a power source for the voltages (enclosure or dock).


    Yes, I need an external power source. I want to buy a power adapter for an external power source (wall socket), just like an enclosure or a dock would use an external power adapter. I am inclined to think that there is a solution without buying a whole enclosure/dock.
  3. das_stig said:


    Unfortunately this is an eSATAp cable which is different. What I need is an external power adapter like jarotech pointed out.
  4. I am an old stick-in-the-mud, and I like to point out that the specs for signals on eSATA cables are different from the specs for signals on SATA. They overlap, so a passive physical adapter will usually work (in fact, one came with my motherboard). But technically they are incompatible and may not work.

    It's not just a different physical connection, the allowed signal levels and the required detection levels are different.
  5. Here's a link to a related question that I opened on Electrical Engineering site of Stack Exchange that got answered.
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