Create backup images of old floppy disks

When you use a device that is not the true block device, cat will fail:

$ cat /media/MSWIN3116 > MSWIN3116.img
cat: /media/MSWIN3116: Is a directory

If you are unsure what your block device is, insert a floppy disk and at the command line use the “df” command.
For my system, since I was using a USB floppy drive the block device was /dev/sdb

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sdb                  1424      1002       422  71% /media/MSWIN3116

Create a disk image from the physical drive:

$ sudo cat /dev/sdb  > MSWIN3116.img

Create an empty floppy image of 1.44 MB:

$ /sbin/mkfs.msdos -C /path/imagefile.img 1440

Mounting it:

$ sudo mkdir /media/floppy1/
$ sudo mount -o loop /path/imagefile.img /media/floppy1/

 

source links:
http://untitledfinale.wordpress.com/2007/10/09/create-mount-and-copy-floppy-disks-images-under-linux/
http://seth.tregenna.org/blog/?p=96