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From: pschwart@vms.macc.wisc.edu (Paul Schwartz)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Do ANY hardware hacks read this group??!!
Message-ID: <1991Feb15.201203.21167@macc.wisc.edu>
Date: 15 Feb 91 22:02:22 GMT
Sender: news@macc.wisc.edu (USENET News System)
Organization: University of Wisconsin Academic Computing Center
Lines: 33

In article <1991Feb15.183139.1285@coplex.uucp>, dannie@coplex.uucp (Dannie Gregoire) writes...

> 
>	I have tried several times to get some answers to some hardware
>questions but have recieved NO replies.  I would assume by the name
>of this group that there are at least a few hardware hacks out there.
>If so, PLEASE answer me this.....
> 
>	What are the hardware differences between 760K and 1.44M 3.5"
>floppy drives???  The limited information that I have tells me that there
>is no difference, but some experimentation tells me otherwise.  
> 
>If you know the answer to this, PLEASE respond.  Thank You.

    All right already, you've gotten my attention...  2 differences 
    1) the 1.44 drives have a sensor in them to detect if there is a little hole
opposite the write-protect tab.  High density disks having the little hole 
punched.
    2) the read/write head on 1.44 drives can punch through a little bit more
current, allowing it to affect the 700 ostreds of magnetic coercivity needed to
read and write high density disks.  (720k disks are at 600 ostreds)

    F.Y.I.   5 1/2 inch HD drives have a smaller head than the 360k drives and
more current, but no little hole.

    						- Z -

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|  PauL M SchwartZ              |                                             | 
|  PSCHWART@macc.wisc.edu       |     The cream may rise to the top,          |
|  PSCHWART@wiscmacc.BitNet     |         but the scum settles from above.    |
|  (608)255-5702                |                                             |
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