Defining Local and Remote Drive Visibility Under Windows NT 4.0 or Windows 2000
The NODRIVES entry (reg_dword) located in
uses a 32-bit word to define local and network drive visibility for
each logical drive in the computer.
The lower 26 bits of the 32-bit word correspond to drive letters A
through Z. Drives are visible when set to 0 and hidden when set to 1.
Drive A is represented by the rightmost position of the bitmask when
the radix is viewed in binary mode. Example: A bitmask of
10000000000000000000000111(0x7h) The bitmask above hides local drives
A, B, and C (rightmost bits from right to left) and drive Z (leftmost
A bit mask of 11111111111111111111111111 (0x3FFFFFFh) would hide all
Administrators may also use the NODRIVES entry to disable access to
floppy drives on a per-user basis, replacing functionality previously
found in the Floplock.exe utility from the Windows NT 3.x resource
Drives hidden using the NODRIVES setting are not available through
Windows NT Explorer, under the My Computer icon, or in the File
Open\Save dialog boxes of Windows applications. File Manager and the
Windows NT command prompt are not affected by this registry setting.
NOTE: If you hide the System drive it is not available under the My
Computer icon or in the File Open\Save dialog boxes, however it is
visible in Windows NT Explorer.