-Download the Tweak UI tool and hide the hard drive partitions the easy way (here).
Or
Open the Windows Registry by clicking the Windows key+R. Type in “regedit” and then press enter. Also, make sure you back up your registry before you do this! Go to the key:
HKEY_CURRENT_USER\Software\Mcft\Windows\CurrentVersion\Policies
Click on “Explorer” and then the “No Drives” key. If there isn’t one, right click the wing and add New-DWORD Value and name a key “No Drives.” Open the key, and it will show 0000 00 00 00 00. The last four double 0's are where you’ll be able to enter values to hide drives and/or partitions. Each set of 0's stands for different letters of drives:
1st 00-Drives A-H
2nd 00-Drives I-P
3rd 00-Drives Q-X
4th 00-Drives Y-Z
The numbers to be inserted into a particular set of double 00's are different depending on the drive’s letter.
01-Drives A,I,Q,Y
02-Drives B,J,R,Z
04-Drives C,K,S
08-Drives D,L,T
16-Drives E,M,U
32-Drives F,N,V
64-Drives G,O,W
80-Drives H,P,X
For example, to hide drive K: the numbers would be 0000 00 04 00 00, and drive A: would be 0000 01 00 00 00. To hide two drives, add the numbers. For instance, to hide drives A: and D: add 1+8=9, so therefore you would get 0000 09 00 00 00.