Xref: utzoo comp.sys.ibm.pc.hardware:7402 comp.multimedia:310 comp.misc:12032 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!ccut!wnoc-tyo-news!ascwide!ascgw!fgw2!fgw!pfrad!ace!melby From: melby@daffy.yk.Fujitsu.CO.JP (John B. Melby) Newsgroups: comp.sys.ibm.pc.hardware,comp.multimedia,comp.misc Subject: Re: Diffs between DD & HD disks Message-ID: Date: 8 Apr 91 17:35:29 GMT References: <1991Apr6.170017.24990@news.iastate.edu> <1991Apr6.234019.2894@agate.berkeley.edu> <571@lysator.liu.se> Sender: news@ace.yk.fujitsu.co.jp Followup-To: comp.sys.ibm.pc.hardware Organization: Open Systems Dept. Div. 2 Sect. 3, FUJITSU LTD. Lines: 22 Nntp-Posting-Host: daffy In-reply-to: zap@lysator.liu.se's message of 8 Apr 91 07:30:41 JST >Most diskette manifacturers use the same media for 1.44 and 720k disks. >However, a test is done on each disk, and if it falls below a certain >threshold in reliability, they go in the 720k bucket, otherwise they >will become 1.44 Meg's..... This depends on which disks you are referring to. This would be the case for double-sided and single-sided high-density disks, but from what I have heard, most manufacturers use separate processes for high-density disks and "ordinary" disks ([12]D and [12]DD). >* Be warned! The letter 'Z' is Copyright >* by Zap Inc. So are the colors Red, Green >* Greenish-yellow (Blue was taken by IBM) Ah, so that explains the "technically unfeasible" story for blue LED's :-) :-) ... * standard disclaimers apply * ----- John B. Melby Fujitsu Limited, Machida, Japan melby%yk.fujitsu.co.jp@uunet