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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Hard Drive Zapping
References: <firstname.lastname@example.org> <3D74CBD9.B718C52E@webaccess.net> <email@example.com>
Date: Tue, 03 Sep 2002 18:44:03 GMT
NNTP-Posting-Date: Tue, 03 Sep 2002 11:44:03 PDT
> > In most drives, the servo information is interspersed in the data.
> > This forms what are called servo sectors in that the servo data is
> > in nearly radial stripes from the edge to the center of the disk.
> > The controller in the drive puts user data between servo sectors.
> I know almost nothing about the software interface to the controller.
> Would it be possible to instruct the controller to overwrite the servo
This is usually prevented in the controller design as far as possible.
There is/was a proposal for self servowrite of drives. This required
some controller modification in some cases. As of 1996, it was not being
done. There are some difficulties that may or may not have been solved.
I did not consider the idea viable myself due to some dynamic issues. In
any case, a controller for this can write anywhere. Anyway, disk
controllers are almost all proprietary so it is hard to find out what
exceptional things they can do. I have never used a disk controller that
you could get a spec sheet for. It's kind of a family jewels thing.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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