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ZD.MAN
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1980-01-01
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Eldar Utilities Ver.1.00
Z E R O D I S K
Eldar Software 1989
The ZD program obliterates free space on disks by specified
values without affecting on the files. It has up to three
parameters:
name of disk to obliterate - simple <letter> or <letter:>
(e.g. 'a', 'c:', 'b:').
Default: the current drive.
value to write to the free space - slash with hexadecimal
2-digits number (e.g. /0D, /3f etc.)
Default: 0
key to suppress messages - /s or /S - useful in batch files
Using the ZD you can obiterate previously used disk space
to avoid distribution of private information and some traces of it
on a disk. The matter is that when you erase file, you don't really
delete it, but only remove it from directory and mark his clusters
as a free. Using PCTools or Norton Utilities you can recover this
information. ZD prevents restoring of file and that is useful
if you are going to transfer disk to somebody, you could not trust,
or if you have process some files with private information using
a hard disk on the computer, which you share with somebody else.
Another use of ZD concerns the careful antivirus handling.
Some viruses use the free space at the end of disk without marking
it as "bad" or "busy". The matter is that space is rarely used so
the probability that this space will be accidently used is sufficiently
low to supply for the virus some viability. Using the ZD you'll remove
the virus code at least partially. Most of all you'll find immediately
that your system stop to reboot from the hard drive, so you'll see
immediately the problem. To clean the system in full reboot from
the clean write-protected disk and use sys c: command to restore
boot sector. If situation does not changed then the Master Boot Record
is damaged. You can use ADM to recover it. Besides that you can
use special software to handle properly Master Boot and boot sectors,
e.g. BC (Boot Control) component from our AntiVirus system Cassandra.