Create a FileSystem under linux

 * Create an empty image

* creating (1GB)
$dd if=/dev/zero of=temp.img bs=512 count=2097152
* formatting
$mkfs.ext2 temp.img
* mounting
$mkdir /media/img
$mount -o loop temp.img /media/img

* Create a disk image from phisical drive

cat /dev/fd0 > imagefile.img

* Copy image to the phisical drive

cat imagefile.img > /dev/fd0