> learned it should be possible, if I specify the 'fragment size' to be
> 1024byte.
>
> The problem is... when and how i could specify the 'fragment size'
> during the installation process.
>
> The installer say that the disk size is an negative value and I
> couldn't edit disklabel.
do it manually

exit sysinst

run disklabel -I -i sd0

then use ? for help, etc..

after writing disklabel do

newfs -m 5 -i <what you like read man> -b 8192 -f 1024 /dev/rsd0a