I just saw on the net that SATA Hard Drive Powere cables are 15 Pin and a IDE power Cable is a 4. Pin

And that the extra PINS are for Voltage and you can buy an adaptor to turn the 15 Pin to a 4. Pin.

But the extra Pins will just be un used and the SATA Drive MAY not WORK.

So what do you do why do they sell the adaptors if they will just leave the extra Pins un used and the drive may not work??All I can come up with is... Incase you want to change from SATA to IDE and back again - That's my guess, but I have no idea.i have used a 4pin to 15pin SATA power cable adapter before and i have never had a problem. actually, i have never heard of DRIVES not working because of this. which make/model of drive(s) have you heard that dont work without the 3.3V terminals being hooked up?If the SATA Drive need 3.3V terminals then when you use the 4. Pin connector if these Lines are not used then why are they there if they are not used in the 4. Pin???Quote

then why are they there if they are not used in the 4. Pin???