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The only way I could reuse the external drive was to check for disk errors and format it if necessary.
If you find that your USB or external hard drive has become inaccessible in such a situation, this tutorial will help you by showing you how to check and format the hard drive for errors using CMD or the command prompt and hopefully access it again.
Check the disk with CMD
In the Windows 8 WinX menu, open a raised prompt and type the following :
/f E :
Here is the letter E of the USB or external drive – or any other drive – where you want to look for errors and correct them. So make sure you replace it with the correct letter in your case and press Enter.
The operation of the control disc is started on the player and any errors detected are also corrected.
After successfully checking the hard drive on my external hard drive, I discovered that I could access it.
Format the drive with CMD
Then I saved the data and decided to format them. To format a drive with CMD, type the following command and press Enter:
Again, E is the letter of the USB or external drive you want to format. So be sure to replace it carefully with the right letter in your case. When you are sure, press Enter. You may also be prompted to enter the disc label. Enter it and press Enter again.
Disc formatting begins.
If you are in a situation where CHKDSK stops responding and cannot recover file corruption when you run the CHKDSK /SCAN command in Windows 8, you can run the system file analysis and see if this helps. Or you can download the KB2906994 patch and apply it to your Windows 8 computer.
Additional information: Check the command line for disk options.
I hope it will one day help you!