5.25" Floppy disk drive not recognized
kuku at kukulies.org
Mon Aug 17 09:20:32 UTC 2020
> Am 14.08.2020 um 22:46 schrieb Polytropon <freebsd at edvax.de>:
> On Fri, 14 Aug 2020 22:38:05 +0200, Christoph Kukulies wrote:
>> 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.
> In this case, using fdcontrol to change the drive's settings
> is probably the correct way to go. Use the command
> % fdcontrol -F -v /dev/fd0
> to see what drive and disk can tell about themselves. If that
> is not correct, use fdcontrol's -s option to change the drive's
It looks like whatever medium I insert, I’m always getting:
# fdcontrol -F -v /dev/fd0
/dev/fd0: 1200 KB media type
Sector size: 512
Transfer rate: 500 kbps
Sector gap: 27
Format gap: 84
Side offset: 0
Inserting a medium which I marked DD-DT (double density double track) at the time I wrote it, gives:
# fdread -d /dev/fd0 -o fd_dump
Reading 80 * 2 * 15 * 512 medium at /dev/fd0
>> OTOH, dd normally used to work on this kind of devices, didn’t it?
> If the (hardware) formatting deviates too much from what the
> drive's settings expect, it will only result in read errors.
> This where something within the chain "OS - controller - drive -
> medium" does not match the expectations. This is where fdcontrol
> can be used to change those expectations. :-)
BTW, looks like Ubuntu Linux adopted the FreeBSD floppy interface, did they?
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