Unable to Open or Format USB Key

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If you are having trouble opening or formatting your pen drive, you can fix this problem by reformatting your pen drive from the command prompt. Here's a simple way how. Click on Start > Run, and type
cmd
. Click on OK.

Assuming your pen drive letter is K drive, you can enter
format /q /x k:
, followed by Enter. Note that you can replace the k with the applicable drive letter.