How To Hide a harddisk partition in Windows Xp/Vista

You may need to hide a drive either for security reasons (to ensure that children do not have access to a backup drive, for example) or for practical reasons (if your PC has multiple memory card readers never used).
Here’s how to do so, under XP and Vista.
A command in the registry will tell Windows Explorer not to display some readers.
Technically, the system uses a binary value of 32 bits where each bit corresponds to a reader. Bit 0 is the drive A, bit 1 in drive B, etc.. When this bit is “1″ the player is hidden, otherwise it is visible.

• Go to Start, then Run and then type regedit.
• Deploy the “HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Policies/Explorer”
• If the DWORD (32 bit) named NoDrives does not exist, start by creating (click the right mouse button and select New then Value DWORD).
• Double-click NoDrives to amend this item, select Base Decimal and enter into the data field the decimal value of the player to hide (e.g. 512 for the drive J: )
• If you hide multiple drives, take their different decimal values and add them.

• A: 1
• B: 2
• C: 4
• D: 8
• E: 16
• F: 32
• G: 64
• H: 128
• I: 256
• J: 512
• K: 1024
• L: 2048
• M: 4096
• N: 8192
• O: 1638
• P: 32768
• Q: 65536
• R: 131072