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

To: T Bowl who wrote (1564)	11/15/1997 7:25:00 PM
From: Gottfried	Read Replies (2) \| Respond to of 9256

TB, you asked >GMR should allow an increase in BPI rather than TPI right? TPI is more a function of the mechanics?< The explanations in brackets are not for you, but are for those unfamiliar with the acronyms. As TPI has increased, so has TMR decreased. But the diminishing signal strength [head output voltage] that results from narrower heads [higher TPI] imposes SNR [signal to noise ratio] limitations. The GMR head delivers higher output for a given track width and so allows higher TPI. But - as you suggested - eventually TPI runs into the limitation imposed by TMR [mechanical tolerances]. For MR and GMR heads the read and write functions are performed by separate elements. So one can write WIDE and READ narrow - to get away from ther need to position the read element exactly in the center of the written track. The short answer is: GMR allows higher TPI. GM