[comp.binaries.ibm.pc] v02i004: zerodisk, erases unused disk blocks

creps@silver.bacs.indiana.edu (Steve Creps) (03/21/89)

Checksum:  382390648  (Verify with "brik", report brik bugs to me -- R.D.)
Posting-number: Volume 02, Issue 004
Originally-from: creps@silver.bacs.indiana.edu (Steve Creps)
Submitted-by: creps@silver.bacs.indiana.edu (Steve Creps)
Archive-name: zerodisk/zerodisk.uue

This is a fairly simple program I wrote to zero out those disk blocks
which have been released when files were deleted, but still contain the
contents of the deleted files. I wanted it to make it easier to search
my hard disk for lost blocks if the (future) need might arrive, but
others may want to use it to keep sensitive but no longer used data
safe.

Disk blocks which are currently used by files are not affected.

Steve Creps, Indiana University, Bloomington
creps@silver.bacs.indiana.edu (129.79.1.6)
{inuxc,rutgers,uunet!uiucdcs,pur-ee}!iuvax!silver!creps
creps@iubacs.bitnet (forwarded)

[
Includes C source.  Apparently compiled with Microsoft C.  Considering
what the program does, it is rather large (8 K) after compilation.

Here's a small batch file that achieves a similar result.  Call it
"zerodisk.bat", and before running it create a small (about 1 K) file
called "zerofile" containing whatever you want to write into the unused
blocks.  It will create a huge file called "newfile" that will use up
all the available space on disk.

     :loop
     copy /b newfile+zerofile newfile
     goto loop

Checksums obtained with the 4.3BSD "sum" or System V "sum -r" command.

checksum     size (bytes)  file (between BEGIN--cut and END--cut lines)
   62247        11637      this uuencoded posting

checksum     size (bytes)  file
    5944         8423      zerodisk.arc

-- R.D.
]

zerodisk part01/01
BEGIN--cut here--cut here
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end
END--cut here--cut here