On Freitag, 4. Januar 2019 22:08:33 CET Francesco Messineo wrote: > 8 inch drives have another interesting characteristic: they need to > reduce the write current when writing on the upper half (tracks 43-77) of > the media. 8-inch floppies are huge, linear velocity of the actual media > under the R/W head varies a lot between track 0 and track 77, so (I'm > assuming) using the same current when the linear velocity of the media gets > too slow (on inner tracks 43-77) produced probably too > large flux areas and needed to be reduced in order to maintain small > enough magnetic areas. If someone has an official explanation why the > 8-inch drives needed to reduce the write current, I'd appreciate to > know it. Maybe you can find something in these links: https://archive.org/details/ bitsavers_motorolaapndWritingInFloppyDiskSystems_1029819/page/n1 http://www.lintech.org/comp-per/07MAGREC.pdf https://www.birmingham.ac.uk/Documents/college-eps/metallurgy/research/ Magnetic-Materials-Background/Magnetic-Materials-Background-11-Magnetic- Recording-Media.pdf AndréReceived on 2019-01-05 00:00:07
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