Thread: iPad External memory Read/Write speeds with iPad Pros (2020) and iPad Air 4
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Old 05-04-2021, 03:42 PM   #8
ilovejedd
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Quote:
Originally Posted by OtinG View Post
I think years ago some of the USB external HDDs required a second USB port to provide enough power to run. However, HDD drives have moving parts whereas SSD and flash drives don't, so HDD drives require more power to run.
Yeah, I had some of those drives.

Some older USB ports can only deliver 100-500 mA (0.5-2.5W) max while some HDDs require ~1A (5W). This became less of a problem with USB3 which supports up to 900 mA.
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