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Corrupt discs

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How often do discs die?

Do the units normally make scratching sounds intermittently while playing?

The reason I ask is that I just got my MZ-NH600 back from Sony. It was giving me "Cannot play or record" errors on many of my discs. They replaced the Holder Assembly and repaired the Transport Mechanism, but they also said that the disc I gave them (so they could replicate the fault) had a corrupted UTOC. These are probably questions for Sony techs, but since Sony's communications are inpenetrable I thought I'd ask you guys:

-Is it possible for the discs to become damaged from magnetic swipe cards? What I've read suggests not, but the discs started corrupting when I started using a swipe card which lives in my bag with the MD.

-The other theory is that since the discs were recorded with a dodgy transport mechanism, perhaps they were recorded badly, so they will not work even with my now-fixed player.

-The final theory, as suggested at the start, is that simply the discs are worn out, since they are about 4 years old.

What do you think?

PS: I can't download the NH600D or NH700 service manuals from this site. They appear to be corrupt. Is there somewhere else I can get them?

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