SATA power connector??

Either should work, whichever is more convenient for your wiring. Desktop HDs don't use the additional 3.3V power that the SATA connector provides (this voltage is targeted at the laptop market). Providing both connectors makes it easier to use as an opgrade device.
 
yes you can use either one, whichever is more convenient, just don't plug in both or it will fry the drive
 
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