Manuel Bilderbeek schreef:
>
> HI!
>
> I'm still trying to fix this bloody drive! I found out some new strange
> behaviour:
>
> Manuel Bilderbeek wrote:
> >
> > Manuel Bilderbeek wrote:
> >
> > I've been researching some more on this drive, and found the following:
> > - If I'm lucky, I get a disk formatted with it (single sided and double
> > sided). Sometimes it gives a disk error, when it's writing the
> > bootsector, but after retrying it always seems to work)
> > - I can save and load files on disks formatted with this drive most of
> > the time. Sometimes I get Disk Offline messages. When I push a little
> > bit to the drivehead, it works again.
> > - Disks formatted with the 8245-drive cannot be read on other (MSX)
> > diskdrives!
> > - I can not read disks formatted on other drives. (I got this only once,
> > I think)
> > little helps.
> >
> > Conclusions: -Drive works perfectly, but the head seems to be misaligned
> > or something!
>
> I was playing with the drive a bit again last night, and found out
> this... After pushing the drivehead a bit, I didn't get Disk Offline
> anymore. So I tried to save some files. It worked every now and then.
> But when I tried to read those files on another MSX, I got Disk Offline
> again! So i formatted the disk on that other (fine working) MSX. Then I
> put the disk back in the 8245 and.... to my astonishment: THE FILES I
> SAVED WITH THE 8245 WERE STILL DISPLAYED AFTER EXECUTING THE "FILES"
> COMMAND!!! Yes! After a very hard low level format of the disk!! But
> when the disk was back in the other MSX, it displayed no files at all. I
> could even save files on that disk on that other MSX, without any
> problems, and STILL the OTHER files (saved with the 8245) appeared when
> executing FILES on the 8245!! The files saved on the other MSX did not
> appear. One strange thing is that there would always appear a file
> called "700" when executing FILES on the 8245, which I don't remember
> saving on that disk... (but I could have forgotten this)...
>
> Hmm, it seems that the 8245 is saving BETWEEN tracks or something??? So
> the head must be REALLY misaligned!?
>
> Strange...............................................
>
> Note that successfully executing a FILES command on the 8245 still
> requires pushing the drive head... otherwise it will still give a Disk
> Offline error. Loading those saved files doesn't work properly, the
> file-contents is corrupted... But the disk seems to work fine on another
> MSX...
>
> Can anyone explain this?
>
I think you have a head alignment error
when the disk is writing to track 0 it's actually writing to track 1
i think the bearing of the worm spindle is worn out (or if some one has
been messing around with it the trck0 sensor is misaligned)
erik de boer
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