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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.
A bit mask of 11111111111111111111111111 (0x3FFFFFFh) would hide all drive letters.
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 kits.
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.