Hide And Lock Your Drives

Open Registry (go to run command, type "regedit" and press enter)

then go to this key

HKEY_CURRENT_USER\Software\Microsoft \Windows \CurrentVersion\Policies\Explorer

now right click in right side pane and create DWORD Value

Rename it as "NoViewOnDrive" (for locking drive)
or
Rename it as "NoDrives" (for Hiding drive)

double click on it and put some numbers to lock ur desired Drive and click ok.

DRIVE NOS.
FOR A : 1
FOR C : 4
FOR D : 8
FOR E : 16
FOR F : 32
FOR G : 64
FOR H : 128

finally restart or log-off the computer to take effect.