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Technology Stocks : Ampex Corporation (AEXCA)
AMPX 11.17+1.6%3:59 PM EST
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To: Joe Valente who wrote (1231)11/13/1997 11:15:00 PM
From: Gus  Read Replies (1) of 17679
 
Joe,

"...am I right in assuming that the material used in making the disk surface has basically NOT changed in the past, say, year and a half?"

Not exactly. My understanding is that everytime a higher density head is used, a higher coercivity (a measure of media density) platter is used. By the way, check out this description of the way disk platters are made.

"..Magnetic information storage media are fabricated by depositing billions of tiny grains or particles on a substrate. This process,
in which the grains or particles are scattered in a random pattern as unique as the random matching of genes that determine the skin ridges of a human fingerprint, fixes the microstructure of any piece of the medium for its lifetime. The magnetic information is imprinted on the medium by magnetizing it appropriately and this writing can be changed as needed. The effect of the underlying permanent microstructure can be sensed through conventional recording techniques. The randomness of the physical microstructure of recording media adds to recorded signal what is known as media noise, an effect that limits recording density and fidelity...."

www-physics.ucsd.edu
Go to 6/24/97 Special Seminar conducted by R. Indeck titled
"MISC Magnetic Recording Investigations"

Gus
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