Hi,
> Atari GEMDOS and Atari partition programs always use 2 sectors per
> cluster. Since FAT16 can hold max 32k entries you can compute the rest
> of information from this (example: 63 MB partition needs 2 kB clusters
> to fit into 32k cluster limit so the logical sector size for 32-63 MB
> partition needs to be 1 kB).
There's something wrong with the Atari FAT option code then - this is what I
get
with atari=yes on the first of your partitions (128MB?):
FAT (before atari): FAT bits 0 clusters 32622 sectors 65280
FAT (option atari): FAT bits 12 clusters 32622 sectors 65280
FAT (after atari): FAT bits 12 clusters 32622 sectors 65280
The GEMDOS option code picks a 12 bit FAT even though it should clearly fit
into
a 16 bit FAT.
With atari=no:
FAT (before atari): FAT bits 0 clusters 32622 sectors 65280
FAT (after atari): FAT bits 16 clusters 32622 sectors 65280
The larger two partitions exceed the logial sector size of 4k.
> > Yup - did AHDI use particular values for logical sector size and sectors
> > per
> > cluster that we'd need to make sure will still work?
>
> See above - 2 logical sectors in a cluster. That is actually the only
> difference from MS-DOS where they stick with fixed logical sector size
> and are adding more sectors to a cluster, IIRC.
Thanks, that'll help me to find a fix for this patch.
Michael
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