> That's what i do, though if a low level format is available, it
> will be a better
> choice. When i wipe SCSI disks i ALWAYS use the format function in the
> SCSI bios.
pn] I only use SCSI drives. That low-level format has been my usual
routine, but it isn't "very" secure, is slow and keeps the machine off-line.
Occasionally (when I had the time), I've copied large "safe" files to a
drive repeatedly until it ran out of space. As with any security measures,
there is rarely absolute security, just varying degrees.
> The command DOES end when the device is out of room. The last time i
> did it was when my accountant gave me an old hard drive. He made me
> promise to wipe the drive before using it, so i wrote zero's to
> it repeatedly.
pn] I forget the exact DoD standard, but it called for at least 3 phases of
alternating 0/1 patterns and I think some program I once had ended with a
"@DEAD" pattern.
> Be forwarned that there may still be ways of recovering the data if an
> organization with lots of $$$ wants to recover data by putting
> the disk under
> an electron microscope. ....but for normal privacy uses zeroing
> the drive should
> suffice.
pn] Every time you write, you bury the previous written info another level
deeper. But a number of recent layers remain retrievable with the proper
technology. I am aware of this, and that's why I asked about a utility.
pn] I should be able to write a shell script do what I need now that I know
more about dd. Thanks for your help, Marina!
---
Peter Nosko
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