28 Jan
2006
28 Jan
'06
4:23 p.m.
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