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From: Kevin.Gmyrek@p5.f121.n324.z1.FIDONET.ORG (Kevin Gmyrek)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Diffs between DD & HD disks
Message-ID: <178.2803A5D5@buscard.FIDONET.ORG>
Date: 10 Apr 91 13:35:00 GMT
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 > From: paixao@ug.cs.dal.ca (Nuno M. Paixao)

 > I was using a machine with a high density 3.5" floppy in it, and wasn't aware
 > that it was high density. Whenever I formatted a disk ( a DS/DD) I simply
 > typed FORMAT. The machine then formatted them to High density.
 >
 > While using that machine, I could store 1.4MB of information on that disk,
 > bu then I tried to take one of those disks to another machine.
 > Neither a low density nor a high density floppy could read my disks
 > (and there were about 12 of them.) Since I had lost access to the orginal
 > machine, I lost over 10 MB of stuff. I wasn't impressed. :-(

Some drives (most notably those in NEC Powermate and IBM PS/2 
machines) will format EITHER DS/DD or DS/HD disks to 1.44Mb.  Most 
require the "hole" to be there in order to format/read 1.44Mb disks. 
I installed a switch in my drive to *force* a DS/HD disk from a DS/DD 
disk without having to drill a hole in each of them.  I suspect that 
your data and/or disks were just fine.  If you had a similar switch or 
had put a hole in the disks you could have read them just fine.
Kinda makes you wonder why someone like *IBM* would allow you to 
format those DS/DD disks out to 1.44Mb, eh?

                                             Kevin

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