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1991-04-18
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Program : ZDISK - Zero unused DISK sectors for security purposes.
Format : zdisk drv Where drv is an optional drive letter parameter
Version : 3.1
Author : S. E. Kleiner
Function : Write over currently unused sectors of a disk to secure
information in files that were deleted. When the DOS
DEL or ERASE commands are used to remove files, they
only remove the files from the directory. The actual
file data still remains on the disk and can be examined
via various utilities. Even when alternate utilities are
used to remove files which do "zero" the file before removal,
many commercial programs erase/delete old versions of a file
when creating a new one (editors, etc.). Therefore,
confidential information may still be left on the disk.
ZDISK prevents recovery of this information by overwriting
all unused sectors on the disk.
Description: ZDISK creates two files in the root directory of the current
drive which fill the entire remaining disk space (generally
for a hard disk), thus covering any usused (deleted) sectors.
The files are made of blocks which consist of a signature:
"ZDisk version xxx was here.",
followed by zeroes (00 Hex). The first file uses 32K blocks
for speed. The second file uses smaller blocks to assure
that every available sector is written to. ZDISK erases the
files it has written, thus returning the space to the available
pool. If an error terminates ZDISK, the temporary files may be left on the
disk using up space. If this happens simply use the
DOS DEL or ERASE command to remove the files from the root
directory.