Date: Sat, 15 Aug 2020 08:23:09 +0000 From: "Thomas Mueller" <mueller6722@twc.com> To: freebsd-questions@freebsd.org Subject: Re: 5.25" Floppy disk drive not recognized References: <46FFA8F9-90AA-42DE-8E8B-CA4383CA7AC6@kukulies.org> <20200814101021.c71f6c23768a5bef685739fe@sohara.org> <20200814071030.3f319e5a@scorpio.seibercom.net> <76A64DE1-B61B-405E-A623-C886819E1977@kukulies.org> <20200814151509.0feef428f3692a1d9a2bb39a@sohara.org> <CAM8r67A8896GM4fsTe-yQnkmz-MCKS0=fN7BwnGF4iixqA4=NA@mail.gmail.com> <0F38A0D7-FD25-4076-A14C-3B75BAC76244@kukulies.org> <86D9EF37-531A-4480-8857-9C495E4BBB8C@kukulies.org> <7CF88C86-6E81-498D-A383-B160D77D8134@kukulies.org>
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> I’m trying to access a 5.25“ floppy disk drive if anyone here knowing what a „floppy“ disk drive is. :)
> neither less or cat works. I cannot totally exclude that the media don’t fit.
> The ones in questions here are CP/M 68k format. They are DD-DT.
> But I won’t get at the problem over the weekend to eventually test other media from which I know they are definitely MSDOS.
> OTOH, dd normally used to work on this kind of devices, didn’t it?
> I’m getting doubts.
> The once was /dev/MAKEDEV for this.
There still is, in NetBSD and OpenBSD.
> Christoph
My first personal computer was with MS-DOS 4.01, which was a big improvement over MS-DOS 3.31.
So I never had CP/M in front of me.
Floppy-disk version of senile dementia did me in, computerwise.
First I would no longer be able to write to the diskette, much later I would not even be able to read the diskette. Formatting would not help, besides destroying all the diskette's data.
I did, in the distant past, use dd successfully to write to 3.5" floppy disks.
I remember the days when FreeBSD installation sets came in chunks intended for dd to floppy disks (base.aa, base.ab, base.ac, ...), and I would not be able to get enough good floppies to do this successfully.
NetBSD didn't do that, and I was quite glad when FreeBSD quit that very inconvenient practice.
Any hope of recovering some of your floppy data with ddrescue? I once used that on a WD Green 3 TB hard drive, rescued most but not all of the data.
Tom