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A primer on CLV vs. CAV
Authored by: dethbunny on Oct 27, '06 02:17:57PM

The disc is recorded in CLV, but most any high-speed drive reads (and likely writes) in CAV. The limiting factor for a high-speed drive is vibration caused by disc balance issues. The more RPMs, the more the disc will wobble. The drive spins as fast as it can while still reading data accurately.

As the track is physically longer toward the outside of the disc, more data can be read per revolution. Since the drive is always spinning as fast as it possibly can and still read reliably, more track, and thus more data, goes by the read head toward the outside. Thus you get much better data rates toward the end of the disc than toward the beginning.



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