1.Click Start - Run (This brings up the Run dialog box)

 2.Type cmd and press Enter (This brings up the Windows Command Prompt
 3.Type diskpart in the command prompt and press Enter (This launches the Diskpart utility within the Command Prompt window)
 4.Now type list volume (This displays a list of all mounted volumes on your computer and their associated drive letters).
 5.Type select volume 4 (or select any other volume as where the drive is present).
 6.Now type remove letter G (Note- This sometime requires a reboot). The drive will no longer be available via Windows Explorer or My Computer.  
Steps To Unhide Your Drive
  1.Click Start - Run (This brings up the Run dialog box)
2.Type cmd and press Enter (This brings up the Windows Command Prompt
 3.Type diskpart in the command prompt and press Enter (This launches the Diskpart utility within the Command Prompt window)
 4.Now type list volume (This displays a list of all mounted volumes on your computer and their associated drive letters)
 5.Type select volume 4 (or select any other volume as where the drive was present)
 6.Now type assign letter G (Note- This sometime requires a reboot)
 The drive will be available via Windows Explorer or My Computer

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