Here is an example:
Hide drives 'ZYXW'
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
NoDrives REG_DWORD 3C00000
where in binary it's: 11110000000000000000000000
each bit represents: ZYXWVUTSRQPONMLKJIHGFEDCBA
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.