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Commonly, external hard drives will acquire power from the computer it is connected to. It is possible, though, to connect external hard drives to an outlet and permanently to the computer, replacing the previous hard drive, though I highly do not recommend such.

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Q: Does an external hard drive require constant power?
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Can the Sony ux be connected to an external hard drive?

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Why are power cables needed in some external hard drives?

Because the moving parts inside a hard drive require power. Bigger hard drives require more power, so a large hard drive may need more power. USB external harddrives get their power from the computer via the USB ports, that is why some USB hard drive have 2 USB cables; both provide power to the drive and one transfers the data. This many not be enough for large hard drives so they need extenal power. (Just think, they could probably work off 4 or 5 USB ports, but most people don't have that many free!)


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