1.44 vs 1.60 MB 3.5 formatting

1.44 vs 1.60 MB 3.5 formatting

Post by John Erik Gies » Sun, 16 Dec 1990 14:16:39



Seeing all of the debate/interest created by AE's FDHD, I thought this may be
of some interest to you GS users:

        Quoted without permission from MicroTimes December 10, 1990 page 218

The Insite I325VM (variable mode) Floptical disk drive is the first 20Mb
3.5" floppy disk drive also able to read and write standard Double
Density and High Density diskettes.  This is achieved by merging optical
and magnetic recording technologies with the use of low cost components
developed for compact disk recording as well as traditional magnetic
floppy diskette drive assemblies.  The Floptical is designed to plug
and play with existing SCSI host adapters for IBM PC, XT, AT, PS/2, Mac,
and other SCSI-compatible computers.  Insite Peripherals, Inc., 4433
Fortran Dr., San Jose, CA 95134.  (408) 946-8080

Note: I am not employed by MicroTimes, nor by Insite Peripherals.  
      I just wanted to share some information.
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1. 1.44 vs 1.60 MB 3.5 formatting

Maybe this has been discussed before, but I don't remember seeing it.  Does
anyone know what the format of a 1.44 MB floppy is based on?  Is it the same
as a 720K (IBM) 3.5, but just with twice the number of tracks, and thus
a constant angular velocity?  Or is is some variant on the 800K formatting?
Are Mac and IBM 1.44 disks readable (sector-wise) by the same drives?
Thanks.

--
Henry Throop



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