ESATAP Power ESATA 50cm USB 5V 12V Combo to SATA 22 Pin + IDE 4 Pin Cable Adapter For Hard Disk Data Cable 2.5"/3.5"
Features:
Voltage: 12V
Cable length: 50cm
System: Notebook or PC with a free Power Over eSATA port
Connection: Power Over eSATA (eSATAp) > SATA 22pin + 4pin Molex
Description
This Power Over eSATA to SATA 22pin cable enables you to connect your 2,5“ or 3,5“ SATA HDD externally to any free Power Over eSATA (eSATAp) port. 
The Power Over eSATA port combines eSATA and USB and enables the power supply of 5V via the integrated USB interface. 
Thus you do not require any additional power supply for a 2,5” HDD. For operation of a 3,5” HDD just connect the Molex-connector to a power supply.
Notice:
For 3,5" HDD > Connect power supply 
For 2,5" HDD > Don´t connect power supply