build a 512MB disk image (1 partition)

dd if=/dev/zero of=512M.img bs=1M count=1 seek=511
sfdisk -S 63 -H 16 -C 1038 512M.img <512M.sfdisk
formathd.sh 512M.img 
gohd.sh 512M.img 


build a 256MB disk image (1 partition)

dd if=/dev/zero of=256M.img bs=1M count=1 seek=255
sfdisk -S 63 -H 16 -C 519 256M.img <256M.sfdisk
formathd.sh 256M.img 
gohd.sh 256M.img