Date   : Thu, 03 May 1990 18:53:00 CDT
From   : LANCE TAGLIAPIETRA <UCSLCT@UWPLATT.EDU>
Subject: floppy drive hardware

Hello,
 
I just finished reading an informative article in The Computer Journal
Issue 44: Mysteries of PC Floppy Disks Revealed by Richard Rodman.
 
I had always wondered how 1.2M and 1.44 Meg storage was achieved on
5.25 and 3.5 inch hardware.  I am glad to see an article covering this
territory.
 
The article did bring a couple questions to mind:
 
(1) What is the difference between 720K and 1.44M 3.5 inch drives.
 
(2) What is the pinout for 3.5in drives. (a pinout for 5.25in is given)
 
Can anyone shed light on this?
 
Lance Tagliapietra (ucslct@uwplatt.edu) or (ucslct@uwplatt.bitnet)