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In my own experience, I saw (heard) a Studer A800 put noise on a tape while in repro and record safe. Unfortunately, it tooks about 6 months to track it down. First, we had to figure out it was our machine, then it took a while to figure out which of the 8 A800's was doing and that it was one specific machine. It was basically intermitant static dicharge.
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That reminds me of an interesting experience I had with a Mitsubishi X880 (I wonder if PSW will censor that M-word back there)...
I mean, quite apart from the way the machine behaves with a power failure (even if parked, the reels would just dump a big pile of fairly fragile 467 on the floor)...
Anyway we had this one project that was backed up every way from here to Sunday, and the masters were up and playing back for a mix. Somehow, though, little sections of tracks were suddenly not playing back. They would just be muted for a little while... then come back. Once a section of a track was silent, however, it stayed that way. Back then I had some hair, and as the assistant on the session I have to say I distinctly remember what hair I had standing up.
Long story short, we discovered that there was a ribbon cable not quite seated in the remote - and that was causing random arming and punching in on various tracks. The only indication this was happpening was the program material disappearing.
If I remember correctly, the master safe was engaged as well (not absolutely sure there was one on the 880 - but if there was it was engaged).
It took a day to restore the backed-up versions of all these tracks.
And I'm awfully glad I suggested
not putting the backups on the same machine until we had figured out the problem.
Doesn't matter what medium you use. Shit will happen.
There are 2 categories of people in the world - those who have lost data and those who will.
JW