|USB devices may not work correctly when they're connected to certain USB ports e.g. ports in a hub or on the front of a desktop case. If you have a desktop computer, you may have an IRQ sharing problem you need to fix, or your power supply may be starting to fail. |
See response 3 in this:
Also - if you are using a USB extension cable, some of them have inadequate wiring and will not work properly with some USB devices.
If that's okay now, you may have data damage.
Programs you can try to recover your data, if your USB port you have it plugged into is okay.
The most frequent reason people can't access data (or experience data damage).
See Response 2: