Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!mcgill-vision!snorkelwacker!usc!wuarchive!rice!uw-beaver!ubc-cs!alberta!mts.ucs.UAlberta.CA!Douglas_James_Martin
From: userDJMA@mts.ucs.UAlberta.CA (Douglas James Martin)
Newsgroups: comp.sys.mac.misc
Subject: Re: Apple file exchange
Message-ID: <1325@mts.ucs.UAlberta.CA>
Date: 12 Sep 90 19:00:33 GMT
References: <1990Sep10.211033.15098@eng.umd.edu> <11907@chaph.usc.edu> <1990Sep11.175832.13343@Neon.Stanford.EDU> <44727@apple.Apple.COM>
Organization: MTS Univ of Alberta
Lines: 24

In article <44727@apple.Apple.COM>, marc@Apple.COM (Mark Dawson) writes:
>>
>I don't know if AFE can read 360K disks, but I've never had any trouble using
>AFE on 720K 3.5" disks (of course, that was about 1 1/2 yrs ago, but I can't
>believe that feature would have been deleted).
>
>Mark
>
You misunderstood slightly, I think.
HD diskettes have an extra hole opposite the write-protect hole.
If you want to read a disk in a Superdrive (as well as many but
not all other HD drives), the format MUST correspond to the
presence/absence of the hole (i.e. 1.44 Meg format is required
if you have the hole, it is forbidden if you don't). The problem
arises if you format a disk using a drive that does not have this
requirement and you do something like format a HD disk for 720K
or a DD disk for 1.44Meg -- your Superdrive won't read it because
the disk format doesn't correspond to the presence/absence of the
hole.
 
Douglas Martin
Printing Services
University of Alberta
1-403-492-4246 (work)    1-403-439-1939 (home)