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Is it safe to use a micro-USB 2 cable in a USB 3 portable hard drive?

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up vote 22 down vote favorite 1 The micro-B USB 3 port seems to be somewhat backwards compatible with the old micro-USB 2 standard. I was able to charge a phone that had the micro-B USB 3 port with a micro-USB 2 cable. However, I am not sure to what extent this is a part of the USB standard or just something the phone manufacturer did for backwards compatibility. I have a hard drive that uses micro-B USB 3. Would it be safe to use the USB 2 standard cable to read/power the hard drive? ie. Use this cable for this port. usb cable usb-storage usb-3 usb-2 share | improve this question asked Nov 20 at 7:20 juil ...