Re: Unswappable memory needed is user space
Paul Flinders (paul@dawa.demon.co.uk)
10 Dec 1998 22:18:02 +0000
"Richard B. Johnson" <root@chaos.analogic.com> writes:
>
> As the disk-drive warms up, it's geometry changes. Data that was
> written when the drive was cold will be on some place on a track,
> maybe on the center, maybe on an edge. When the drive is at its
> final temperature, new data will be written in a slightly different
> place on the track.
They (also) use the fact that data which has been on the disk for a while
"prints through" deeper into the magnetic oxide covering. Apparently you
can quite literally shave off the top of the oxide and read older data
beneath.
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