On Tue, 20 Apr 2021 18:09:04 -0700, (Dave
Platt) wrote:

In article ,
Lucifer wrote:
I have a Denon DMD-M10 minidisk recorder that will not play disks
recorded on other machines nor will it record on a disk that has been
used before. I was able to record on an unused disk which does play.

At a guess, I'd suspect that it might be any of the typical faults
which can develop in any laser-optical-based disc recording and
playback system:

Thank you for your reply.
However minidisk uses magnetic recording and playback similar
to a floppy disk. The laser is only used when recording to heat
the disk and thus allow it to be altered by the magnetic write head.

- Deteriorating laser (lower output level)
- Dirty laser or read-back optics (dust, tobacco or cannabis smoke
particles and tar)
- Dirty or poorly-lubricated "sled" on which the optical assembly moves
- Misadjusted servo tracking system

Power-supply problems e.g. deteriorating filter capacitors, loose
cables, intermittent contacts, etc. can also be a problem as these
devices age.

I would say those things are OK as it plays a disk I recorded but
not disks recorded on another machine.
I'm thinking it's out of alignment.

None of the above is at all specific to your recorder model. If
you're serious about trying to fix it, I'd suggest getting the
model-specific service manual

That's a good idea.

(there's one up on eBay from a seller in
Florida - no connection).