Date: Fri, 14 Aug 2020 21:30:12 +0200 From: Polytropon <freebsd@edvax.de> To: Christoph Kukulies <kuku@kukulies.org> Cc: User Questions <freebsd-questions@freebsd.org> Subject: Re: 5.25" Floppy disk drive not recognized Message-ID: <20200814213012.94e94a14.freebsd@edvax.de> In-Reply-To: <76A64DE1-B61B-405E-A623-C886819E1977@kukulies.org> References: <46FFA8F9-90AA-42DE-8E8B-CA4383CA7AC6@kukulies.org> <20200814101021.c71f6c23768a5bef685739fe@sohara.org> <20200814071030.3f319e5a@scorpio.seibercom.net> <76A64DE1-B61B-405E-A623-C886819E1977@kukulies.org>
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On Fri, 14 Aug 2020 15:40:54 +0200, Christoph Kukulies wrote:
> Fine. There may be many solutions. Actually I’m trying to use the tools I have nd not buy extra hard- and software.
>
> I might also buy a used ISA-bus computer with a VGA Monitor :)
>
> FreeBSD always has been a good platform to experiment at low level.
>
> Meanwhile I’ve proceeded a bit as can be seen in a previous post. Only this is a riddle to me:
>
> # dd if=/dev/fd0 of=fd_dump
> dd: /dev/fd0: Device not configured
> 0+0 records in
> 0+0 records out
> 0 bytes transferred in 0.000262 secs (0 bytes/sec)
Try with bs=512.
> Also # cat /dev/fd0 >dump
> cat: /dev/fd0: Device not configured
>
> Why?
That seems to be a problem with hardware formatting: The
drive does not correctly respond to drive commands, or the
medium doesn't suit the drive.
As there are many possible combinations: It looks like you
are using a "PC drive", a 5.25" 1.2 MB drive. What kind of
disks do you try to read?
I suspect some kind of incomatibility here...
> I recall there were devices like
>
> fd.360
> fd.1200
> fd.1440
>
> or some such in earlier times where you could choose the right device.
Yes, those were present on Linux, if I remember correctly,
such as /dev/fd0.h1440 (the typical HD, high density, DS,
double sided, 3.5" disk drive).
> Also using mtools gives me similar messages:
>
> # mdir
> plain_io: Device not configured
> init A: could not read boot sector
> Cannot initialize 'A:'
Is the disk in the drive a MS-DOS formatted (FAT) disk?
% mdir
Volume in drive A has no label
Volume Serial Number is 2483-A8C1
Directory for A:/
drvspace bin 65479 1996-09-05 11:11
command com 96324 1996-09-05 11:11
format com 51111 1997-05-01 12:14
sys com 19143 1996-09-05 11:11
[...]
debug exe 21162 1996-09-05 11:11
chkdsk exe 28976 1996-09-05 11:11
uninstal exe 76896 1996-09-05 11:11
22 files 993 649 bytes
242 176 bytes free
If everything works correctly, you should be able to see
something like this. Furthermore, using mount_msdosfs
should work (note: for reading disks, always use -r to
avoid any kind of writing attempt).
% sudo mount -t msdosfs -o ro /dev/fd0 /media/floppy
% mount | grep floppy
/dev/fd0 on /media/floppy (msdosfs, local, read-only)
% df -h /media/floppy/
Filesystem Size Used Avail Capacity Mounted on
/dev/fd0 1.4M 1.2M 236k 83% /media/floppy
% sudo umount /media/floppy
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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