Since I upgraded to Window 10 my laptop doesn't recognize my older USB hard drives. They were all formatted under Windows 7 file system. Grant it, it has been a couple years since I have last tried to read/write to these 3 separate drives, I would think they should still be readable on any computer. I don't have any other computer to try to plug them up to so I haven't tried to see if they're able to be read on a different system. I bought a new usb hard drive and it has no problems being read/written to. Does anyone have any ideal as to why my older USB hard drives have become unusable? What are some trouble shooting steps I can take to try to remedy this issue?