ufiformat - Format a USB floppy disk.
Raw level format is to write gap,index,sectors to the unformatted disk using special commands specific to the disk controller, to make the plain magneto-sensitive film into sector-addressable medium. Note that raw level format is NOT about creating filesystems (fs(5)) on the disk.
After mid-1990's, floppy disks are sold generally pre-formatted in MS-DOS 2HD format: 80 cylinder, 2 heads, 18 sectors/track, 512 bytes/sector; it is seldom in need for raw formatting. Nevertheless raw formatting could cure some disk and drive mismatchings.
WARNING: You will NOT raw format an LS-120 disks or (removable) hard disks; they are precision formatted in factory and cannot be raw reformatted.
ufiformat supports only the following format capacities:
The above format capacities are predefined in the program, but each USB floppy device also has a limited set of formats (defined internally) that it can format media to. The allowed format capacities are obtained by querying (-i) the device, but this only returns the total format capacity and not CHS (cylinder, heads and sectors), hence a mapping is required in the program.
# modprobe sg # ufiformat -i /dev/sda vendor: Y-E DATA product: USB-FDU write protect: off media type: 2HD status block size kb formatted 2880 512 1440 formattable 2880 512 1440 formattable 1232 1024 1232 formattable 2400 512 1200
# ufiformat -f 1440 /dev/sda # mkdosfs -I /dev/sda
You often need to be root to do anything with /dev/sd*.
"Universal Serial Bus Mass Storage Class - UFI Command Specification"
Revision 1.0 December 14 1998