An explanation for anyone interested.
From: Peter Easthope
Date: Mon, 17 Nov 2014 18:02:09 -0800
> Therefore take any diskette which the bare PC can boot from and
> try to boot the virtual machine from it.
>
> Here fd0 twitches; then an error.
> address@hidden:~$ sudo qemu-system-i386 -fda /d
> From: "Peter Easthope"
> peter@armada:~$ sudo qemu-system-i386 -fda /dev/fd0 -vga std -boot a
> qemu-system-i386: -fda /dev/fd0: could not open disk image /dev/fd0:
> Input/output error
>
> I/O error? Why? Certainly it is read/writable.
>
> peter@armada:~$ ls -l /dev/fd0
> brw-rw---T 1 root
From: Dale R. Worley
Date: Mon, 17 Nov 2014 10:38:29 -0500
> ... the -drive option will make *any* /dev/sd*
> look like an ordinary disk to the guest OS.
OK, here is a very simple exercise.
http://wiki.qemu.org/download/qemu-doc.html#sec_005finvocation
contains,
"-fda file
...
You can use