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From: mrgofor@mmm.UUCP (Michael Ross)
Newsgroups: net.micro.mac
Subject: Re: HFS compatability and Software backup - Simple solutions
Message-ID: <454@mmm.UUCP>
Date: Tue, 4-Feb-86 16:27:08 EST
Article-I.D.: mmm.454
Posted: Tue Feb  4 16:27:08 1986
Date-Received: Sun, 9-Feb-86 07:32:54 EST
References: <1636@Shasta.ARPA> <348@ccivax.UUCP> <1667@Shasta.ARPA> <425@mmm.UUCP> <597@puff.UUCP>
Reply-To: mrgofor@mmm.UUCP (Michael Ross)
Distribution: net
Organization: 3M Company, St. Paul, Minn.
Lines: 35
Summary: 

In article <597@puff.UUCP> hammen@puff.UUCP (Zaphod Beeblebrox) writes:
>In article <425@mmm.UUCP>, mrgofor@mmm.UUCP (Michael Ross) writes:
>> In article <45@gumby.UUCP> hammen@gumby.UUCP writes:
>> >
>> >The way the protection works is if a sensor sees the little red light shine
>> >through the hole of a locked disk, nothing gets written to the disk.  
>> >However, I've been told that it is possible to instruct the IWM to turn off
>> >the light, thereby making the disk writeable....
>> >						Robert J. Hammen
>> >						Manta Software Corp.
>> >						U of Wisc. CS Dept.
>> >						hammen@gumby.uucp
>> 
>> Then how come my Sony disks work? The write-protect mechanism on those
>> diskettes doesn't include a hole going through the diskette - there is a 
>> small tab that can be moved back and forth, but you can't see through the
>> diskette in either mode.
>> 
>> 	--MKR
> No, you don't seem to understand.  The tab that you slide back & forth IS
> the hole that I'm referring to. (I never said the hole was in the actual 
> media).  When the tab is moved so that you can see through the CASE of the
> microdisk, then the disk is locked.
>
>						Robert J. Hammen

	No, you don't seem to understand. The CASE does NOT have a hole
in it. No matter where the tab is, you cannot see through the case. I know
what you mean about the holes, but my point was that I think it must be
mechanical rather than optical in nature because of the fact that some
(not all) of my Sony diskettes do not have a hole all the way through.
There is an easy way to check - I could just look at the damned drive
and find out, but I'm too lazy. Besides, ungrounded speculation is fun.

	--MKR