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- Newsgroups: comp.os.msdos.misc
- Path: sparky!uunet!paladin.american.edu!gatech!destroyer!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!psygate.psych.indiana.edu!nate
- From: nate@psygate.psych.indiana.edu (Nathan Engle)
- Subject: Re: Using HD disks as DD disks
- Message-ID: <nate.986@psygate.psych.indiana.edu>
- Keywords: disks, disk drive
- Sender: news@usenet.ucs.indiana.edu (USENET News System)
- Nntp-Posting-Host: mushroom.psych.indiana.edu
- Organization: Psych Department, Indiana University
- References: <jeric.67@berkp.uadv.uci.edu> <1992Dec23.202219.114@cbnewsm.cb.att.com>
- Distribution: usa
- Date: Wed, 23 Dec 1992 21:54:52 GMT
- Lines: 28
-
- evans1@cbnewsm.cb.att.com (Dan Evans) writes:
- >jeric@berkp.uadv.uci.edu (Jeric Woo) writes:
- >>I have some high density 3.5" and 5.25" diskettes that I would like to
- >>use as low density diskettes. However, whenever I attempt to format them
- >>(using low density drives) I get either the messages "Bad or Invalid Media"
- >>or the message "Track 0 Bad, Disk Unusable."
-
- >The LD drive heads are larger then the HD heads. As a result the LD heads
- >are reading more then one track at a time on the HD disk. Track 0 isn't
- >bad, it's just smaller then the LD drive is capible of reading it.
-
- There's an additional purely mechanical problem with using 5 1/4" HD
- disks in DD drives. DD 5 1/4" disks have a reinforcing "hub ring" that
- provides a thicker handle for DD drives to grab onto. HD disks do not
- have such a ring, so when you stick your HD disk in that DD drive there's
- a strong possibility that the disk won't be seated in the exact same
- alignment that it was when the data was originally written. Repeatedly
- removing and reinserting the disk will get you there eventually, but it's
- a bad idea as far as long term storage is concerned. If you're doing this
- to be able to exchange data with PCs that only have 360K drives then
- get yourself a bunch of real 360K floppies. You might even want to install
- a real 360K drive in a "media translation" machine so that you can write
- your 360K disks in a way that practically guarantees no hitches.
-
- --
- Nathan Engle Software Juggler
- Psychology Department Indiana University
- nate@psygate.psych.indiana.edu nengle@copper.ucs.indiana.edu
-