Article View: comp.sys.ibm.pc
Article #14482Re: Why no single density?
From: Stefan M. Vorkoetter
Date: Tue, 18 Nov 1986 14:05
Date: Tue, 18 Nov 1986 14:05
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In article <1293@hoptoad.uucp> farren@hoptoad.UUCP (Mike Farren) writes: >Single density disk controllers write the data to the diskette at 250K bit/ >sec. Double density controllers do so at 500K. The IBM controller has only >the 500K clock on board - it would take a hardware change to allow it to >do 250K. Not impossible, just impossible with the standard controller. There is more of a difference between single and double density than that. Double density is basically single density with some redundant flux transitions left out to allow more data to be recorded without increased media bandwidth. To record 250Kbps at single density requires just as high a clock rate as to record 500Kbps at double density.
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!rutgers!clyde!watmath!watnot!watmum!smvorkoetter From: smvorkoetter@watmum.UUCP (Stefan M. Vorkoetter) Newsgroups: comp.sys.ibm.pc,comp.sys.tandy Subject: Re: Why no single density? Message-ID: <673@watmum.UUCP> Date: Tue, 18-Nov-86 09:05:11 EST Article-I.D.: watmum.673 Posted: Tue Nov 18 09:05:11 1986 Date-Received: Tue, 18-Nov-86 22:04:46 EST References: <437@moncol.UUCP> <1293@hoptoad.uucp> Reply-To: smvorkoetter@watmum.UUCP (Stefan M. Vorkoetter) Distribution: net Organization: U of Waterloo, Ontario Lines: 11 Keywords: Intel 8272a, FDC, IBM-PC, Tandy 1000