3 ms·

Nope. They don't (spin at a constant rpm). Perhaps that's not so surprising; after all, it's not vinyl. Furthermore, varying rpm is explicitly mentioned in the

• jasomill 4y ago
  While the CD data format is defined in terms of constant linear velocity[1], and CD data is always written at a fixed linear density (plus or minus a small margin of error), some drives are, under ideal conditions, capable of both reading and writing this format in CAV mode, as addressed briefly in the "Writing Modes" section of the linked article, http://www.osta.org/technology/pdf/cdr_cdrw.pdf#page=15 http://www.osta.org/technology/pdf/cdr_cdrw.pdf#page=15 In CAV modes, data rate — and laser power, in the case of writing — is a constantly increasing function of the radial position of the read/write head. [1] Though this fixed velocity — and, by extension, data density — is allowed to vary from disc to disc. Assuming the standard (4.3218 Mbit/s raw) data rate, any velocity between 1.2 m/s and 1.4 m/s is permitted, but must then remain fixed within IIRC, a +/- 0.01 m/s margin of error.