Take a close look at the connectors in the photo here
http://www.cpumedics.com/9s1132-020.html
It shows that drive with the normal two SATA connectors (smaller one near center for power, larger one at left end for data) plus a 4-pin Molex male connector at the right hand end. That design was common in the early days of SATA drives - if you do not have any SATA power connectors from your PSU, you can use the Molex instead, but never both.
Your photo appear to have adapters already mounted over the two normal SATA connectors. Plus, it appears to have some cover over the Molex connector. There were many laptop machines that did this. They were already using a particular non-standard connector for their HDD units, and simply plugged an...