This simple registry hack allows you to hide drives from appearing in the Windows Explorer shell. Users will not be able to select or see the drive in the applications’ open and save dialogs, My Computer and Windows Explorer but it remains visible from other shells such as, the command prompt. Therefore, applications can still access the hidden drive, even though it is invisible to end users! A hidden drive may be useful when backing files to a network or local drive and you would like to restrict that drive just for backup purposes. The risk of filling up that drive with unrelated data is limited by making it invisible to users including you, while it remains available to the backup application. Obviously, first set the backup destination drive from the backup application and then hide the drive as explained below.
Windows 7 by default hides empty drives in Windows Explorer and this may puzzle users looking for removable media drives (such as card readers). These do not show in the Computer folder if no media is inserted. However, there is an option to make these devices appear by following these simple steps: