These are for laptops where 5V is supplied though the pins on the connector.

I have thought of using them in past but then these adaptors were too expensive for just an experiment, but they seem to have got much cheaper now.

Nevermind! I think I've figured it out.

It seems regular IDE is 40 pin and these are for 2.5" 44pin laptop size, which provide 4 additional pins for power.

For use in desktops you'd need another adapter.

I guess I'm better off getting a regular SATA to IDE adapter to avoid having to use double adapters.

I guess I'll leave this up in case anyone ever runs into this haha.

Edit: Thanks for confirming Tiido 😀 wrote this as you had written your reply. Funny to see you here I think I had you on MSN/Skype back in the day 😁

I use a few of these in laptops. They actually work well for this purpose, and since I had plenty msata drives left over they where a cheap solution for old laptops! 😉

Note that these adapters come in 3.3v and 5v variants, as some laptops provide 3.3v.

I was looking at a similar converter, but from M.2 SATA (not pcie) to 44-pin IDE. Getting an M.2 SATA SSD and converter would be cheaper then getting a 2.5" SATA SSD.

However I ended up going for an M.2 to normal SATA converter and then a SATA to IDE converter as that combination was cheaper and more useful for other possible future projects.