"Linards Ticmanis"  wrote in message 
news:49174c2f$0$32673$9b4e6d93{at}newsspool2.arcor-online.net...
>mojoehand wrote:
>> Can anyone tell me what this disk is? Obviously it has something to do
>> with DOS 3.2.1. Was it some type of updater disk?

>I don't know, but maybe a 16-sector disk (or disk image) that can be used 
>to create a DOS 3.2.1 13-sector disk?

I would second your guess. The naming convention is consistent with what you 
say. Based on the following which expands on what you said:

http://en.wikipedia.org/wiki/Apple_DOS

"Apple DOS 3.1, which was the first disk-based operating system for any 
Apple computer, was released in June 1978 for the Apple II, which had been 
on the market for a little less than one year. A second bug-fix release came 
afterwards, addressing a problem with its MASTER CREATE utility, which was 
used to create Apple DOS master disks. (The built-in INIT command created 
disks that could be booted only on machines with the same amount of memory 
as the one that had created them. MASTER CREATE included a self-relocating 
version of DOS that would boot on Apples with any memory configuration.)"

"In machines with 48k or more memory, DOS always occupies the region from 
$9600 to $BFFF (3 file buffers + 10k of software), but it was intelligent 
enough to load in a lower memory area if less system memory were available."

"Apple DOS 3.1 disks used 13 sectors of data per disk track, each sector 
being 256 bytes in size. It used 35 tracks per disk side, and could access 
only one side of the floppy disk, unless the user flipped the disk over. 
This gave the user a total storage capacity of 113.75 KB per disk side, of 
which about 10 KB were used to store DOS itself and the disk directory, 
leaving about 100KB for user programs."

I'll dig a little further while I have my coffee.

Bill
--- SBBSecho 2.12-Win32