How To Recover Hidden Data Due to Virus from removable Derive :

open command prompt

cmd

then enter in the drive by entering its name:  H

H:/cd

H:/ dir/ah

H:/ attirb –h –s  /s /d

wait for few seconds or a min. depending upon the amount of the hidden data.

that's it enjoy.

or try to use this: attrib –s –h /s /d *.*