Toshiba MK2565GSXN SATA 2.5 HDD

Hey there, 93Sport.

It's probably a 4-pin Molex power connector. Check out these photos
image05.jpg
SATA07.png

Basically if you have such a connector you could either use it or the SATA power connector (not both) to power up the drive.

Hope that helps.
Boogieman_WD