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- From: worley@a.cs.okstate.edu (WORLEY LAWRENCE JA)
- Newsgroups: comp.os.msdos.misc
- Subject: Re: Using DD disks as HD disks?
- Message-ID: <1993Jan13.001856.16143@a.cs.okstate.edu>
- Date: 13 Jan 93 00:18:56 GMT
- Article-I.D.: a.1993Jan13.001856.16143
- References: <93012.37231.LJ01066@LMSC5.IS.LMSC.LOCKHEED.COM>
- Organization: Oklahoma State University
- Lines: 36
-
- From article <93012.37231.LJ01066@LMSC5.IS.LMSC.LOCKHEED.COM>, by LJ01066@LMSC5.IS.LMSC.LOCKHEED.COM:
- >
- >>In article <1992Dec30.104013.28558@Princeton.EDU>,
- >>bathurst@phoenix.Princeton.EDU (Bruce Bathurst) writes:
- >>|>HD diskettes are coated,
- >>|>like DD, but then polished more to reduce surface bumps that would
- >>|>produce magnetic irregularities. This thins the coating. The lower
- >>|>density drive is designed to penetrate a thick coating with
- >>|>magnetism;
- >>|>when it does this to the thin coating, the magntic domains grow
- >>|>sideways rather than downward and may interfere with other tracks.
- >>|>
- >
- >>From this and other things said, can I use (cheaper) 3 1/2 DD disks in my HD
- >>drive without problems? Assuming I ADD THE SECOND HOLE?
- >
- > Rebuttle: Although the below statement is somewhat correct, it should be
- > pointed out that dd and hd disk median is not the same. The drive head
- > current used to write to the disk depends on what disk the computer thinks
- > it's writing to. Although you can convert dd to hd via below method and
- > you may not ever expierence problems, for a master copy of some data you
- > risk loosing it over time. Hdensity head current is lower than dd and the
- > dd median is designed for a higher current. Despite that some people feel
- > disk makers are using the same disk but charging us more for hd is not
- > true. Also they really don't check the unused side of a dd disk.
- ^^^^^^^^^^^^^^^^^^^^^^^^
-
- I must disagree with you about this last statement. A 3 1/2" DD disk (which
- the original writer was referring to) uses BOTH sides of the disk, not one
- side. Now, in the "old" days (Atari 8-bit, C-64, TRS-80) the diskettes were
- single or double sided, and you could punch out your single-sided 5 1/4" and
- use both sides. You may have a point, perhaps the manufacturers of THOSE
- diskettes didn't check BOTH sides of a single-sided disk, but 720K DD 3 1/2"
- certainly are tested on both sides (because the USE both sides)!
-
- -Jason
-