> > > I recently tried using dd to transfer a binary image to floppy.
> > > It was the Linux root disk image, color.gz. Basically, dd works
> > > ok with non-gzipped files, but with files in gzip format, it
> > > chokes:
> > >
> > > root@lc186 floppies# dd if=color.gz of=/dev/rfd0
> > > dd: /dev/rfd0: Invalid argument
> > > 2453+1 records in
> > > 2453+0 records out
> > > 1255936 bytes transferred in 42.665771 secs (29437 bytes/sec)
> > >
> > > Notice the line that says:
> > >
> > > 2453+1 records in
> > > ^^^^^^
> > >
> > > For some reason, it is offsetting to 1 before writing to disk.
No, that's not what it means. You are ignoring the error message on
the preceeding line. "2453+1" means that it has read 2453 complete
records and one extra byte. The 'fd' driver has (correctly) refused to
write the single trailing byte.
> It appears to have worked. I guess the output block size of 16k
> is key for floppies, then. The conv=osync does the padding.
No, the block size requirement for floppies is 512 bytes, as it is for
almost any device. conv=osync is correct if you insist on using the
raw device.
Note that the optimal block size for 1.44MB floppies is 9k (one track).
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