After connected the hard drive to a laptop (Windows 10, 64 bit, USB 3.0), the warning message was shown as “D:\ is not accessible. The parameter is incorrect” then I tried to connect it again and the green loading bar on file explorer window had been extremely slow and finally been frozen before completed download. Another warning block appeared “You need to format the disk in drive D: before you can use it”. That message made me frustrated. It was illogical because if I formatted it, I would lose all my data. By the way, I tried to solve that problem for a week but still could fix it (I tried following several possible suggestions such as checking the USB port, run the device manager, update drivers, etc.)
Ps. I never drop my external hard drive. I just keep it in a bag and put it on a table.