Format a USB flash drive using gpart

[Wojciech Puchar]

> Floppy disks aren't partitioned/sliced - they use 'dangerously dedicated'

they use "dangerously obsolete" mode. nobody use them at all.

> disk's empty.  If you're on an old system and run 'gpart show da0' and don't 
> see a partition table it's quite easy to forget to check if da0 itself 
> contains a filesystem.

unless it is a normal way of using it.