Date   : Wed, 25 Jul 1990 09:34:00 EDT
From   : Brainwave Surfer <AGNEW@Ruby.VCU.EDU>
Subject: Lance's T's question about quad dens disks..

Dear Lance....

since this probably is of general interest....
Single and Double-density disketts have a lower magnetic hysteresis and
are easier for read/write heads to maniplulate the magnetic particles.
Quad-density disks are higher, and corresponds to metal cassette tapes,
you can read them all day long, but you can't record onto them since the
normal cassette tapes can't "flip" the magnets on the tape.

It seems like your drive is of the lower density version, and the disks are
of a higher dens.  I got this from the info-dec-micro list, by the way.

I use el cheapos from Babbages, double dens double sided, and my VT180
single dens single sided loves them.  I tried "flippies" for a while,
but disk management becomes a problem..  hope this helps!!!!

         /^^^\   \ /   Jim Agnew         AGNEW@VCURUBY.BITNET,
        /      >  ||   Neurosurgery,     AGNEW@RUBY.VCU.EDU
   /\_/     '   \  /   MCV-VCU           This tape will self destruct in
 /________________>    Richmond, Va      five seconds.  Good luck, Jim..."

> INFO-CPM Digest V90 #123
> What disk for an 80tk ds dd Tandon TM101-4 drive
>Well, the subject about says it all.  I would like to know where I can get
>disks which will work in my 96tpi 80tk ds dd Tandon TM101-4 drives which
>Montezuma Micro CP/M will format to 820K.  I just bought a box of Kodak MD"-HD
>disks which are rated at 96tpi, but they do not format, every track fails
>the verify pass.  These disks are made for high density drives (1.2Meg).
> 
>In the past, I have found Radio Shack 80tk 5.25" disks to work well, and also
>some brands of 48tpi disks.  What is different about the high density disks
>that they will not work properly on my drives?
 
Lance Tagliapietra   ucslct@uwplatt.edu or ucslct@uwplatt.bitnet