[ale] Large floppy format capacities.

Benjamin Scherrey scherrey at innoverse.com
Mon Jun 11 18:18:48 EDT 2001


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	I'm playing around with the various "nonstandard?" format capacities under 
linux (specifically RedHat 6.2 with a 2.2.19 kernel) and am having trouble 
figuring out how and why certain things work and don't work.

	I've been able to get my 1.4MB 3.5" floppy drive to format and work up to a 
1.722MB drive by formating it as /dev/fd0H1722, which is a device that RedHat 
installed and is described in the man pages for fm. Looking in the linux src 
documentation (/usr/src/linux/Documentation/devices.txt) I see that, 
theoretically, I should be able to get a 1.92MB format capacity via a device, 
/dev/fd0u1920. Unfortunately that device doesn't exist under my RedHat and 
MKDEV complains it doesn't know how to make it. Interestingly, /dev/fd0H1722 
does not exist in the linux documentation, however /dev/fd0u1722 does (and 
also exists under my /dev directory). 

	*Is* it possible to get the 1.92MB capacity out of my drive? Can someone 
point me to some (relatively) definitive documentation about these drive 
capacities and how they are implemented? I noticed that /etc/fdprm allows you 
to describe floppy formats but I can't find the documentation needed to be 
able to create a new entry for another format.

	thanx & later,

		Ben Scherrey


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