Difference between external hard drive with power supply and without it

Hello,
I would like to know if it's better to buy an external hard drive without power supply, the hd wil het power fromthe usb port.
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More about difference external hard drive power supply
  1. Both work fine, but if you want a larger faster 3.5 inch drive you need an external power supply. The smaller 2.5 inch externals will work off USB power. Not really a better question, just one of what you need in terms of drive size and form factor.
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