Piflik said:
2x, 16x, 48x doesn't matter...the Angular Momentum of a DVD (12cm diamter, 15g weight) at 8000rpm is below 225 µJs (I calculated the worst case...assuming all the mass is concentrated at the rim of the DVD instead of distributed evenly across the whole area...easier math...). Turning that without damaging the disc should be a nobrainer...
lets see..spinning it without damaging the disc isn't the problem, spinning it and then wobbling the system around is the problem, and even soft foam pads aren't going to stop that and will infact cause other problems including the foam pads rubbing off and lodging in the dvd drive making it fail completely.
and yeah..sorry but your wrong, the gyroscopic affect on the disc is vastly larger then you calculated go watch the mythbusters episode about a cd or dvd blowing up inside a computer because it ran too fast, 46x would be something on the level of 20000rpm, and they were destroying disks left and right at such high rpm's, the gyroscopic force literally started bending the disk while in spin causing it to shatter apart.
the gyroscopic force wants to maintain its balance when the disc is spinning when you uplift the system or wobble it you change the relative angle at which the gyroscopic forces are pushing on the disc thus causing it to continue its balance and rub against the laser lense assembly.
get a pc, get a high rpm dvd drive and wobble the system around and it will likely do the same thing.