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Re: Erasing a hard disk easily
From: Darren Reed <avalon () cairo anu edu au>
Date: Fri, 16 Jul 2004 18:44:35 +1000 (Australia/NSW)

In some mail from Gary E. Miller, sie said:
Hash: SHA1

Yo Darren!

On Thu, 15 Jul 2004, Darren Reed wrote:

Have you ever actually used format on Solaris to format a SCSI disk ?

Yes, many times.
If I have been simplifying things a bit much it is because I am
not sure how many other folks out there have EE degrees, have advanced
disk drive electronics experience and really need to know the nitty
gritty details.

See below.

The trick is not so much read/write percentages, like has been discussed
here, but off-center tracking and subtle timing/speed changes.

Yup, this is all old news.  Have you got something new to say ?
There are papers around on what's required to read back data from a
HDD and what the methods exploit.  Something that can't be found
from a reference of Peter Gutman's home page:


Maybe if you said something about how you implemented the format, etc,
algorithms or what they did compared to what dd does, whether or not
they write "raw data" to the disk, to create a formatted track, as
opposed to just writing to the formatted blocks.  For reference, Amigas
(and other, older computers) would let you access floppies in a number
of ways, and I imagine that the hard drive would have its own for
read/write vs format or not? Can you interact with SCSI mode pages and
change what read/write gives you?  Did/do people implement that and
just not document it?

It would be nice if further email didn't sound like an extract from
your C.V./resume.  I don't need to know (or care about) how many times
you've worked for X, Y & Z, etc, or even when.  Sorry for being harsh
but I'd rather see the signal to noise ratio try and tip in the signal
direction, if possible.


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