2.4 Megabyte Floppies

[jim stephens]

Mr Ian Primus wrote:

>--- Chuck Guzis <cclist at sydex.com> wrote:
>
>  
>
>>On 9/8/2006 at 8:32 AM jim stephens wrote:
>>
>>    
>>
>>>These are 5 1/4" form factor floppies, but hold
>>>      
>>>
>>twice the data.  I have 
>>    
>>
>>>already searched ebay and google, so I need other
>>>      
>>>
>>suggestions, or someone
>>who can
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>>>part with some
>>>      
>>>
>>Scarcer than hen's teeth, I'm afraid.  These went
>>with the Drivetec drives
>>that could be found in the Kaypro Robie.
>>    
>>
>
>I've seen them used in IBM terminal controllers as
>microcode floppies. The drives for said terminal
>controllers are easy to find - I have many. Disks are
>scarcer. I don't know if the IBM 2.4 meg disk is the
>same as the ones used by the Kaypro. I also don't know
>much about how the format works.
>
>-Ian
>
>
>  
>
I am looking for the Microcode variety.  I have a lot of Drivetec media,
but I am not certain that is what is needed for the 2.4mb drives.

I have not researched anything on the 2.4mb drives or formatting, any
links or info on that?  I would doubt they had the Drivetec type approach,
because these floppy drives appeared before the Drivetec stuff was out.

Maybe this was just a different media, head and double the wiggles, rather
than the Drivtec approach of embedded servo, and all that rot?  They were
shooting for 30mb on a floppy, IIRC and had a drive that would sort of
do that after Kodak took them over.  The 6mb variety was just something
they put out to try to survive, but their drives and electronics sucked
and doomed them.

Jim