Lock drive by registry

•  We don’t usually prefer to lock our drives, but sometimes it becomes nesscary. Say for instance you might have stored your office documents in D:\ and you don’t want your kids to access it, in such case this technique can be useful for you. Please don’t try this tweak with your root drive (usually C:\ is the root drive) since root drives are not intended to be locked because they are mandatory for the system and application programs.
• Start & Run and type Regedit to open Registry editor
• Browse HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\Explorer
• Create a new DWORD value NoViewOnDrive and set its value as

2^ (Alpha Number of Drive Letter-1) where Alpha number are simple counting of alphabets from A to Z as 1 - 26
For example: to lock C:\, Alpha number of C is 3 so 2^ (3-1) = 4 (decimal value)

• To lock more drives, calculate the value of each drive and then set sum of those numbers as value
• To unlock your drive just delete the key from the registry.