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Technology Stocks : Compaq
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To: rudedog who wrote (43431)1/13/1999 1:04:00 PM
From: rupert1  Read Replies (3) of 97611
 
rudedog: It was a serious question. I don't understand the physics involved.

(Having once lost the better part of a book-length manuscript on an early model computer in about 1987, I was astonished to be told that specialist laboratories could recover it. Then even more astonished to find out from the specialists that it was irrecoverable because somebody had applied an engineers programme which had wiped the hard disc clean, forever).

But to return to the physics - do I understand that the data is in the form of electronically inscribed "marks" on the disk: that when deleted it just sits there but is "bracketed" by new marks in such a way that it is not "read". So when one "frees up" the disk by deleting, one is just making the old "deleted" data available to be written over. Assuming that I understand that correctly, what happens to the data when it is "overwritten". Is it removed, distorted or suppressed?

Even if overwritten are there programmes available to recover it?
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