How can a MiniDisc just erase itself?!?!?!

[mbriant]

Could the magnetic field from a loudspeaker erase a MD? Or damage the TOC?

Just wondering.

 

[MacDEF]

Quote:

Originally posted by mbriant Could the magnetic field from a loudspeaker erase a MD? Or damage the TOC? Just wondering.

Fortunately, that's not possible. MiniDiscs are simply magneto-optical discs -- unless the recording laser is focused directly on a data block, there is no way the polarity of that block can be changed.

 

[Beagle]

Having more MD problems. Home deck JE440.

After I record, I press PLAY and what I recorded plays. I power down, the info saves then shuts off. I power back up, I press PLAY, the disc plays.

HOWEVER, when I eject the disc and reinsert it, it reads BLANK DISC and there's nothing there.

What's going ON? This is VERY upsetting. I have over 100 MD's that will basically be useless.

 

[gloco]

Very odd stuff going on there Beagle. What the hell is wrong with your gear man?

It really sounds like the TOC are being corrupted when powering down...do you happen to hit STOP then power down? Very odd indeed, i've been using the same deck for over a year, it's never did anything funky at all (crosses fingers and toes)

 

[MTRH]

Quote:

Originally posted by MacDEF Fortunately, that's not possible. MiniDiscs are simply magneto-optical discs -- unless the recording laser is focused directly on a data block, there is no way the polarity of that block can be changed.

I'm afraid it's not that simple.
The platter is very sensitive to external infereference, however, the protective case suggests what you describe very unlikely.

 

[ProFingerSk8er]

Quote:

Originally posted by Braver my Sharp MDP won't let you open it when it hasn't finished writing the TOC, very handy feature.

so does my n10, before/while it's editing TOC, the eject switch is useless. no matter how far u push the eject switch, it just wont open

 

[Beagle]

Quote:

Originally posted by gloco Very odd stuff going on there Beagle. What the hell is wrong with your gear man? It really sounds like the TOC are being corrupted when powering down...do you happen to hit STOP then power down? Very odd indeed, i've been using the same deck for over a year, it's never did anything funky at all (crosses fingers and toes)

OK, here is the order:

1) I record a couple of tracks, press stop. Press play, the tracks are there and they play
2) Press Power button off, flashes 'TOC writing' as normal, then shuts off.
3) Power on, display still indicates the tracks are there. Press play, they play.
4) Eject the disc, reinsert, flashes TOC reading for long time, then 'Blank Disc'
5) Insert disc into my other portable MD player (MZ-R50) and it also says 'blank disc'

So it appears that the 'recorded' tracks are staying in the memory of the MD deck but not getting onto the disc? Perhaps the TOC is not being written? But why can I power off, power up and they are still there? Perhaps there is a time period where the information stays in the machine. I think there should be some kind of error message like 'cannot write TOC' or something, so you know what's wrong. Computers can do this.

It's very odd, and very upsetting. I corrupted and ruined two discs last night. I have had the odd problem in the past with full discs reading blank disc when I insert them. But this is not an uncommon problem, I've heard of other cases with people having these problems, as discussed earlier in this thread.

But when it records, plays back, still plays after powering on and off, but is blank when ejected and reinserted, this is very strange.

But I did find something on minidisc.org which seems to mirror my problem. But it does not really say exactly what's broken.

Quote:

Q:Whenever i finish a new recording the songs will play but when i take the minidisc out or when the player turns off and i try to play the disk the BLANKDISK message apears on the screen and the recorded songs wont play. A: You can know if the MD recorded only after the recording was completed, the TOC was written, and you play the recorded material. Time advancing, track marks, and monitoring the sound is indication that some parts of the MD are working fine, they do not indicate that the whole recording system is good. What you see on the display is that signal is received by the MD, converted into digital or directly processed and sent to the recording system. We don’t know if the signal is actually recorded and if it is, we still need to wait for the TOC writing. In some cases data is recorded but the TOC cannot be written. This ends with blank disc. If the recording head is broken we will find that the material was not recorded at all. If it is good but the laser unit is weak (it can still be good for playback) for the recording process which needs 10 times more power then in play mode we end with “disc error”. If part of the disc was recorded before the problem occurred it would be erased, because the TOC area will be destroyed. The material may still be present on the disc but not accessible

 

[Beagle]

I took my MD deck into the Sony Store last night for repair. Found my receipt and saw I had taken the three year extended warranty, so I am covered 'till August 2004.

There is a silver lining to every cloud.