do i really need a y cable for a vaio hdd enclosure?

Zero Cool

New member
it says to plug in one side to the enclosure,then plug in 2 usbs into my pc one for data and one for power. Do i really need to plug in both because i have seen enclosures that dont require this dubling of cords. I have a hp dv7-3165 and think that it would put out enough power but not sure can anyone help me out?
 
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