Xerox 820-II diskette formats

Steven Hirsch snhirsch at gmail.com
Mon May 4 16:11:09 CDT 2009


On Mon, 4 May 2009, js at cimmeri.com wrote:

>
>
> Steven Hirsch wrote:
>> On Sun, 3 May 2009, Chuck Guzis wrote:
>>> The 820-II 8" samples in my library show 77*1*26*256 and 77*2*26*256 
>>> formats.

>> That's fairly conservative, but works out to almost a 1MB for the DSDD 
>> diskettes.  Most systems I'm familiar with formatted at 32 x 256 in DD 
>> mode.

> What?!   Using what controller chip?  How that's even possible while 
> maintaining the same 360rpm?

Too early in the day...  Just checked the sources for the formatter, and 
it's 30 256-byte sectors per track not 32.


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