Use this option
with care since it wipes out all data from deleted files, making recovery with most recovery tools
impossible. The Microsoft Knowledge Base article at http://support.microsoft.com/kb/
315672/ provides details on how to perform this task safely.
/X Creates a backup of the current EFS certificate and keys into the specified file. If you supply
the EFSFile input, the utility only backs up the current user??™s certificate. Otherwise, the utility
backs up both the EFS certificate and any required keys.
/Y Displays your current EFS certificate thumbnail on the local PC.
When used by itself, the Cipher utility displays the current encryption state of files in the current
directory. You can supply a directory without any other arguments to see the encryption state of
files in other directories. The utility shows all encrypted files with an E and all unencrypted files
with a U.
Compressing Data with the Compact Utility
One of the advantages of using NTFS is the file compression feature that it includes. Using file compression
means that you can store more information on a single hard drive. In addition, due to the
manner in which hard drives work, you can experience a small performance gain by using compression
(compaction).
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