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Technology Stocks : Disk Drive Sector Discussion Forum -- Ignore unavailable to you. Want to Upgrade?

To: Gottfried who wrote (7194)	10/6/1999 9:51:00 PM
From: La Traguhs	Read Replies (1) \| Respond to of 9256

Yes indeed. Appreciate you making what I didn't make clear - clear. Regards, LT

To: Gottfried who wrote (7194)	10/7/1999 3:49:00 AM
From: Z Analyzer	Read Replies (2) \| Respond to of 9256

<<Offtrack performance [error rate while the head misregistered a certain percentage of track width ]has been a key measure for determining feasibility of a new design. Designers estimate the track misregistration [TMR] a new drive may see, then test on the spin stand after dialing in that TMR. >> Any idea whether that percentage of track width error (TMR) varies much as track width decreases? In other words, is it assumed that the actuator, suspension and radial charactoristics of the tracks will continue to improve proportionately? Also, am I correct in my belief that recent areal density improvements have come largely from increases in linear density. It seems to me that the situation is reversing. Is IBM's record drive at 67,000 TPI not at least a three fold improvement over current track densities which would imply that linear density is increased by no more than about 60 percent? It seems that these increased TPI are now expected to come largely from the benefits of microactuation which I had always heard would result in a doubling to quadrupling of track densities. (The relatively modest increases in suspension cost to accomplish this would seem to be a bargain, althogh not essensially free like much of the past density improvements). If linear density improvements are becoming harder to come by and track density improvements had become difficult with further anticipated improvement coming largely from microactuation, once this new technology is optimized, can we expect that overall density improvements become harder to come by. One would expect that as paramagnetic limits are approached (where ever they might be), that the law of diminishing returns would set in. -Z