floppy drive problem

Nathan Kinkade nkinkade at dsl-only.net
Mon Apr 21 10:51:57 PDT 2003

On Mon, Apr 21, 2003 at 07:08:01PM +0200, Chris Pockele wrote:
> Hello,
> I've got a 486 laptop running a FreeBSD 4.7-STABLE snapshot from
> february 4th.  Unfortunately its floppy drive is acting weird under FreeBSD:
> nomad# mount -t msdos /dev/fd0a /mnt
> fd0c: hard error reading fsbn 0 of 0-3 (ST0 40<abnrml> ST1 10<data_overrun> ST2
> 0 cyl 0 hd 0 sec 1)
> msdos: /dev/fd0a: Input/output error
> nomad# dd if=/dev/fd0a /mnt
> dd: unknown operand /mnt
> nomad# dd if=/dev/fd0a of=/dev/null
> fd0c: hard error reading fsbn 0 (ST0 40<abnrml> ST1 10<data_overrun> ST2 0 cyl 0
>  hd 0 sec 1)
> dd: /dev/fd0a: Input/output error
> 0+0 records in
> 0+0 records out
> 0 bytes transferred in 7.328928 secs (0 bytes/sec)
> When I boot with an OpenBSD boot disk and try the same, it shows similar error
> messages.
> Does anyone have an idea about how to start debugging or fixing this?
> -- 
> Chris

Notwithstanding apparent problems with your entire floppy subsystem,
your dd command is incorrect.  The syntax should be something like:
# dd if=/dev/fd0 of=image.flp

Take a look at dd's manpage.

You can usually get dd to copy data off a damaged disk with the
following command:
# dd if=/dev/fd0 of=image.flp conv=noerror

Note that this won't prevent data loss.  It may allow you to recover
good blocks off failing media, though.  How confident are you about the
cable and the drive itself?


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