search for: 8203k

On 07/08/2014 05:55 PM, H. Peter Anvin wrote: > On 07/08/2014 03:05 PM, Alexander Perlis wrote: >> >> Question: what's special about the transition from 8203KiB to 8204KiB? >> Both have CHS=8/64/32 and both involve a fractional end cylinder. > > Fractional cylinders with floppy disks is almost certainly a very bad thing. > Agreed, but that doesn't appear to be the issue here. Fractional 8203K FreeDOS does work, yet larger values, inc...

...faces, and to lend support to the hypothesis that there is a definite transition (i.e., everything below a certain size will work, everything above a certain size fails): fdos_8000KiB works fdos_8125KiB works fdos_8180KiB works fdos_8192KiB works (8MiB) fdos_8200KiB works fdos_8202KiB works fdos_8203KiB works ----------------- fdos_8204KiB loops fdos_8205KiB loops fdos_8208KiB loops fdos_8215KiB loops fdos_8250KiB loops fdos_8500KiB loops fdos_9000KiB loops fdos_9216KiB loops (9MiB) Question: what's special about the transition from 8203KiB to 8204KiB? Both have CHS=8/64/32 and both involv...

On 07/08/2014 04:42 PM, Alexander Perlis wrote: > On 07/08/2014 05:55 PM, H. Peter Anvin wrote: >> On 07/08/2014 03:05 PM, Alexander Perlis wrote: >>> >>> Question: what's special about the transition from 8203KiB to 8204KiB? >>> Both have CHS=8/64/32 and both involve a fractional end cylinder. >> >> Fractional cylinders with floppy disks is almost certainly a very bad >> thing. >> > > Agreed, but that doesn't appear to be the issue here. Fractional 8203K > Fr...

...ied, newmkfloppyimg always tells me H=64 S=32 and then C is the > approximately the number of MB. And MEMDISK auto-determines those exact > same numbers. But if I manually call mkdosfs there's a lot more output, > most of it ignored by newmkfloppyimg. In particular, the output for > 8203K and 8204K is different: > > mkdosfs -I -v -C test8203 8203 > mkdosfs 3.0.12 (29 Oct 2011) > test8203 has 64 heads and 32 sectors per track, > logical sector size is 512, > using 0xf8 media descriptor, with 16406 sectors; > file system has 2 12-bit FATs and 8 sectors per cluste...

...zes I've tried, newmkfloppyimg always tells me H=64 S=32 and then C is the approximately the number of MB. And MEMDISK auto-determines those exact same numbers. But if I manually call mkdosfs there's a lot more output, most of it ignored by newmkfloppyimg. In particular, the output for 8203K and 8204K is different: mkdosfs -I -v -C test8203 8203 mkdosfs 3.0.12 (29 Oct 2011) test8203 has 64 heads and 32 sectors per track, logical sector size is 512, using 0xf8 media descriptor, with 16406 sectors; file system has 2 12-bit FATs and 8 sectors per cluster. FAT size is 8 sectors, and provi...