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From: enchant@oliveb.UUCP (Dan Crocker)
Newsgroups: comp.sys.ibm.pc
Subject: Re: IBM PS/2
Message-ID: <3648@oliveb.UUCP>
Date: Fri, 21-Aug-87 19:19:41 EDT
Article-I.D.: oliveb.3648
Posted: Fri Aug 21 19:19:41 1987
Date-Received: Sun, 23-Aug-87 08:13:45 EDT
References: <1338@dataio.Data-IO.COM> <3735@well.UUCP> <1426@chinet.UUCP> <797@unccvax.UUCP>
Organization: Olivetti ATC; Cupertino, Ca
Lines: 43
Summary: 1M disks in 2M drives

In article <797@unccvax.UUCP>, cbenda@unccvax.UUCP (carl m benda) writes:
> In article <1426@chinet.UUCP>, ward@chinet.UUCP (ward) writes:
> > a PS/2-50!  I fully expected the "density identification hole" on the
> > 2M diskettes to be read by the drive, but, sigh, no.
> 
> 
> It will.  Try this. place the format program in a different directory
> on the hard disk and have a path to THAT directory.  Next, go into a
> different directory on C: and put a diskette into A:.  Next type format a:
> 
> You will find that now, DOS 3.3 is smart enough to use the hardware
> to check to see if the diskette is actually a 2M diskette.

I tried exactly this on my model 50 and I didn't get the same results.
Here's what I did.
1. I created a directory called temp
2. I copied format.com into it
3. I deleted the format.com that was in root

4. I did a cd to temp
5. I put a 1M disk into drive a: and ran format
   The format completed without problems

6. I did a cd to root and set path=\temp
7. I ran format again on the 1M disk
   Format worked fine

From what I have seen, the system DOES NOT know what media is in the
drive.  Furthermore, I am pretty sure don't know that the IBM floppy drives 
have NO switch to detect the media.
I really want to understand what you have done, so I have a few questions:
a. What was the message dos gave you when format failed?
b. Can you determine who the manufacturer of your 2 meg floppy is?
   I have seen drives made by Alps and Mitsubishi.

I really would appreciate your help.  Thanks

				dan
-- 
Here comes the supernatural anesthetist
If he wants you to snuff it
All he has to do is puff it
He's such a fine dancer