grinding down chips was Re: QX10 graphics board

[Chuck Guzis]

On 1/28/2006 at 7:08 PM William Donzelli wrote:

>Magnetic media also has a pretty good "memory", even after many, many
>erasings and rewrites. I seem to remember you can get the "history" of a
>magnetic area on a disk by looking at the very edges of that area, as it
>builds up like growth rings in a tree.

As I recall, it's a long hard process.  I'm trying to recall the original
paper by some guy in Switzerland using a modified STM.  I think he said he
could retrieve about 1000 overwritten bits per hour.

--Chuck