If you want to hide all drives in My Computer then what are you thinking let apply the below syntax.
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\Explorer
create a new DWORD value as NoDrives and modify its data to 03FFFFFF(six F's)
reboot and you are done.
To change back.
delete the key or modify the data to 0. (zero)
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