hastighed for diske

jeg ved ikke hvor mange omdrejninger de spinner med, men 42x skal ses i relation til de første drev der kom ud. Det er i relation til dem de 42x skal ses. Senere kom der 2x og så 4x, 8x etc.

Drevet kører i øvrig kun 42 x i de ydertse spor da hastigheden ved læsning, i de inderste spor, holdes nede da cirklen i de inderste spor er mindre = større vinkel. Husk, der skrives inde fra og ud. Omdrejningstallet er jeg også blank over for.

taget fra: http://en.wikipedia.org/wiki/Optical_disc_drive
Bær venligst over med det engelske ... jeg orkede ikke, at oversætte det  :-)

There are mechanical limits to how quickly a disc can be spun. Beyond a certain rate of rotation, around 10000 RPM, centrifugal stress can cause the disc plastic to creep and possibly shatter. On the outer edge of the CD disc, 10000 RPM limitation roughly equals to 52x speed, but on the inner edge only to 20x. Some drives further lower their maximum read speed to around 40x on the reasoning that blank discs will be clear of structural damage, but that discs inserted for reading may not be. Without higher rotational speeds, increased read performance may be attainable by simultaneously reading more than one point of a data groove [3], but drives with such mechanisms are more expensive, less compatible, and very uncommon.