A. This can be done using the TWEAKUI utility from the
"My Computer" tab, and just deselect the tick next to drives you want
to hide. All this does is change the registry value
\Explorer\NODRIVES which is a 32-bit word (DWORD). 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 viewed in binary mode.
e.g. A bitmask of 00000000000000000000010101(0x7h)
The bitmask above hides local drives A, C, and E
Drives hidden using the NODRIVES setting are not available through Windows Explorer, under the My Computer icon, or in the File Open\Save dialog boxes of 32bit Windows applications. File Manager and the Windows NT command prompt are not affected by this registry setting.