Updated: Mon Feb 4 2008
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- securely erase data from magnetic and solid-state memory
(c) 2002-2008 Jetico, Inc. http://www.jetico.com
bcwipe [-VvsbBdrifhSF] [-m mode] [ -n sec ] FILE...
Repeatedly overwrites special patterns to the files to be destroyed.
In normal mode, 35 passes are used (of which 8 are random).
Patterns used were recommended in article by Peter Gutmann
entitled "Secure Deletion of Data from Magnetic and Solid-State Memory".
In quick mode, U.S. DoD(Department of Defence) 5220.22-M standard are
used with 7 pass wiping. In custom mode U.S. DoD 5220.22-M standard are
used with user defined number of passes.
- -h (help)
Display help and exit.
- -V (version)
Display version and exit.
- -f (force)
Force wipe files with no write permissions.
Also suppress interactive mode.
- -r (recurse into subdirectories)
Remove with wiping the contents of directories recursively.
- -i (interactive)
Prompt whether to wipe each file.
- -I (disable interactive)
Never prompt whether to wipe each file.
- -v (verbose)
Explain what is being done.
- -l (verbose light)
Explain what is being done without progress.
- -b (block device)
Wipe contents of block devices
U.S. DoD 5220.22-M seven pass extended character
rotation wiping with last pass verification.
35-pass Peter Gutmann's wiping.
One pass zero wiping.
One pass test mode.
First 4 bytes of every 512 bytes block will contain block number.
- -m <mode> (custom wipe)
U.S. DoD 5220.22-M
pass extended character rotation wiping with last pass verification.
- -n <delay>
seconds between wiping passes. Modern enterprise level storage systems (NAS, disk arrays etc.)
employ powerful caches. To avoid undesirable caching effects BCWipe allows user to insert adjustable
delay between wiping passes. Please note that when wiping with delay between passes disk space is freed
after the last pass.
- -w (wiping only)
BCWipe version 1.7 (and later) verifies last pass wiping result according to U.S. DoD 5200.28 standard
for all wiping modes above. Use the option to disable the last pass verification.
- -d (do not delete)
Do not delete file(s) after wiping.
- -S (wipe file slack)
Wipe files slack. File slack is the disk space from the end of a file till the end of the
last cluster used by that file. Cluster is minimal portion of disk space
used by file system.
- -F (wipe free space)
Wipe free space on specified filesystem.
- -s (system random)
Use system random. Default is SHA-1 (Secure Hash Algorithm).
System random faster but less secure then SHA-1.
Use 64Kb random pattern for random passes instead of full random.
Much faster (especially on slow CPU) but less secure!
bcwipe -rvf ~/sources
# forced wipe of ~/sources directory recursively with Peter Gutmann's scheme
bcwipe -bvmd /dev/hda
# wipe entire /dev/hda disk with 7-pass DoD standard
bcwipe -bvm3 /dev/fd0
# wipe /dev/fd0 floppy with truncated 3-pass scheme (faster, but less secure)
bcwipe -r *
# recursive wipe of current directory with Peter Gutmann's scheme
Original version: Jetico, Inc. <email@example.com>
- SEE ALSO
linux.jgfs.net manual pages