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Technology Stocks : Compaq
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To: rupert1 who wrote (43438)1/13/1999 1:51:00 PM
From: TigerPaw  Read Replies (1) of 97611
 
What "sees" the "erased" data on a disk?
I wish I could post pictures on SI. Try to imagine a ring of steel with a tiny gap on one side. The whole ring except for the part with the gap is wound with wire. If the gap is held close to a moving magnetic source (like a disk surface) the magnetism tugs on the electrons first on one side of the gap (A little tug counterclockwise on the ring) and then on the other side of the gap (a little tug clockwise). The wire wrapped around the ring has it's electrons tugged a bit by those in the ring. Moving electrons are called electricity, which is boosted by amplifiers.

Disk heads are relatively speaking big and clumsy compared to the more sensitive and smaller heads used to find erased data. Those big clumsy rings leave a lot more slop behind for sensitive equipment to read.
TP
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