[ale] OT: CD drive and revolution speed correlation?

[Devnull]

On Wed, Mar 4, 2009 at 09:35, Jim Kinney <jim.kinney at gmail.com> wrote:
> I'm pretty sure the rotational speed for any given value is not fixed
> but variable based on head location. If speed is fixed, bit rate
> increases with increased distance from spindle. I would expect the
> data rate to have a factor of pi in it somewhere since it relates to
> radius and circumference.
>

Please, correct me if I am wrong, but I thought that CDs are written
with CLV (Constant Linear Velocity), so that the drive modulates the
CD revolution speed in such a way that data passes over the head at an
equal frequency. [1] When I use the eject command, I am changing the
high level speed (i.e. 1x, 2x, 3x, 4x), and not the RPM speed. If you
want, I can provide you with a copy of my data.

[1] http://everything2.com/e2node/Constant%2520Linear%2520Velocity
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