[ale] Large floppy format capacities.

[Bao C. Ha]

The /usr/src/linux/Documentation/devices.txt tells you the 
major and minor of the various floppy devices.  You should
be able to make one for the correspond formats.

I don't think you can do 1920 consistently, but the 1680
superformat is stable and widely used.

Bao

> -----Original Message-----
> From: owner-ale at ale.org [mailto:owner-ale at ale.org]On Behalf 
> Of Benjamin
> Scherrey
> Sent: Monday, June 11, 2001 3:19 PM
> To: Atlanta Linux Enthusiasts
> Subject: [ale] Large floppy format capacities.
> 
> 
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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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