minfo a:
device information:
===================
filename="/dev/disk1s2"
sectors per track: 32
heads: 255
cylinders: 4781

mformat command line: mformat -t 4781 -h 255 -s 32 a:

bootsector information
======================
banner:"BSD  4.4"
sector size: 2048 bytes
cluster size: 32 sectors
reserved (boot) sectors: 32
fats: 2
max available root directory slots: 0
small size: 0 sectors
media descriptor byte: 0xf0
sectors per fat: 0
sectors per track: 32
heads: 255
hidden sectors: 0
big size: 39005820 sectors
physical drive id: 0x0
reserved=0x0
dos4=0x29
serial number: 90871701
disk label="MARKS IPOD "
disk type="FAT32   "
Big fatlen=2381
Extended flags=0x0000
FS version=0x0000
rootCluster=2
infoSector location=1
backup boot sector=6

Infosector:
signature=0x41615252
free clusters=780861
last allocated cluster=199494