I've recently written a floppy disk image to a floppy using the command
(as suggested by the image's creator) cat nameofimgfile.144 > /dev/fd0 .
It did, in fact, write the image file to a floppy.  I decided to try it
with another, different floppy image - this one called something like
nameoffile1440.img.  This one also wrote to floppy correctly (created a
bootable floppy with that img file on it).  Now, however, I am unable to
mount the floppy drive again, or to write another image file.  I get the
message: cat: (or dd:) /dev/fd0: Device or resource busy.  mount /dev/fd0
/floppy gets the response: mount: /dev/fd0 already mounted or /floppy
busy.  umount -l /floppy gets the response: umount: /floppy: not mounted.
Using MC to look under the directory /floppy shows an empty directory.
I'm sort of curious as to how access to the floppy drive has been
apparently disabled now.  Just as importantly, I'm wondering how I might
re-enable access?  Can I kill some process that is occupying /dev/fd0?
If so, how?  Any tips on re-enabling floppy access, short of rebooting?

System: Debian Sid with newest 2.4 kernel and probably devfs.

Thanks, James
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