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DOS Command 'subst'

subst is a DOS command used for substituting paths on physical and logical drives as virtual drives. In the past it has been used for revealing hidden drives on security-tense PCs.

Usage

This is the description as output by DOS under XP: 

Associates a path with a drive letter.
subst path]
subst drive1: /D
drive1:        Specifies a virtual drive to which you want to assign a path.
path  Specifies a physical drive and path you want to assign to
               a virtual drive.
/D             Deletes a substituted (virtual) drive.
Type SUBST with no parameters to display a list of current virtual drives.

This means that, for example, to map C:'s root to X: you would use subst X: C:\ at command line. Upon doing this, a new drive called X: would appear under 'My Computer'. The command subst is available in post-Win2k DOS command prompts.