Writing to a floppy...
 

I can't seem to do it! Here's my method:

But that says the filesystem is 'read-only' so I tried changing write permissions but to no avail. My media is a standard 1.44MB high density floppy. Any suggestions? Thanks.

In fact /dev/fd0 is the device file for floppy, you work with data on its mount point.

Generally /mnt/floppy, so put the floppy in the drive, mount /mnt/floppy and redo
your copy but :

cp <directory> /mnt/floppy

do no forget to umount /mnt/floppy before eject it or you may loose datas