• Go to run
• Type “diskpart”.
• Type “list volume”.
• Now select the volume you want to hide by typing “select volume n” (n is the volume number against the drive you want to hide). eg: select volume 2.
• Type “remove letter x”(x is the drive name). eg: remove letter D.
• Done, now check my computer.
• If you want to show the drive again then repeat step 1 to 4 then type “assign letter x”.

Note: Don’t try with drive C. If you have locked something with Folder lock or other software then after assigning the drive everything will be unlocked.