Setting cylinders to 0 fixes runtime connecting an USB disk with 'vvfat' mode
(disk size is always set to 504M / could be a vvfat specific option).


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12489 6c8e4198-a580-4521-a02f-c9ae86df1db9