Windows NT maintains default administrative shares that cannot be
removed permanently. These shares are created for the Windows NT root
directory where the system files are kept and for the root of each
hard drive partition. The shares have a dollar sign ($) suffix, are
invisible to network browsing, and are only accessible to accounts
with Administrator, Backup Operator, or Server Operator privileges on the particular machine. For example, you might have the following default shares:
WINNT$
C$
D$
You can disable these shares, but only for the current session. When
you restart Windows NT, the shares will be reenabled. You cannot
change the permissions on these shares anytime. If you attempt to do this, you receive the following message:
This has been shared for administrative purposes. The permissions
cannot be set.