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From: smsmith@hpuxa.ircc.ohio-state.edu (Stephen M. Smith)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: 720k Drives on AT
Keywords: 720k drives AT
Message-ID: <1991Mar6.005244.13069@magnus.ircc.ohio-state.edu>
Date: 6 Mar 91 00:52:44 GMT
References: <1991Mar5.204203.16929@sbcs.sunysb.edu>
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dhoelzer@csserv2.ic.sunysb.edu (David S Hoelzer) writes:
>	I've been having a spot of trouble lately.  I have recently come 
>to possess a 3.5" 720k drive.  I installed it in my AT with a modicum of 
>trouble.  It works fine, except for one thing..
>	If I insert a disk and take a directory, no problem.  I then eject
>this disk and insert another.  I attempt to take a directory and lo, it
>displays the directory of the disk that I have just ejected!  If any action is
>taken to write to the disk, kiss that baby good bye..  It seems to store an
>image of the FAT and the directory and never refreshes it unless you force it
>to re-read it.. Something like a chkdsk will do it..

Every couple weeks or so someone posts a message describing the same
problem.  The first thing you should do is to make sure you are not
using a disk cache.  If you aren't, then the problem is that your
drive is not detecting a disk change.  There is something in the
circuitry of the drive which should be tripped when you change disks,
and obviously it is not working on your drive.

Now, as to solving the problem, I don't know if it's something as
simple as a jumper, or if something is wrong mechanically.  Anybody
got the exact answer?

SS