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Silly question, but what's the difference... Watch

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    Between a desktop external hard drive, and a portable external hard drive? Is one just bigger/heavier? Also, regarding the Seagate desltop external drive (1TB)
    - is it any good, and does it need to be plugged in all the time? Or just connected to the USB? Thanks.
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    Portable ones do not need an external power source while the desktop ones need an external power supply.
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    Like bigmo7 said, the main difference is that desktop ones will need mains power, whereas portable ones are powered from USB (they usually use two USB sockets, one of them purely for the extra power).

    The actual drive itself also differs in size - desktop ones will have a 3.5" drive inside, whereas the portable ones will have a 2.5" drive inside. As a result, the portable ones tend to be smaller and slimmer, and manufacturers tend to build them to be pocket sized and more slick. In contrast, the desktop drives are larger and (sometimes) more rugged. They'll also have feet etc., and generally be easier (and more aesthetically pleasing) to keep on a desk than their portable counterparts.
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