From: Michael Geary (Mike_at_Geary.com)
Date: Sat Nov 03 2001 - 10:26:53 EST
> > What causes the noise? I believe the CD is seated as tightly
> > on the spindle as possible. It is a clean, factory CD (no
> > paper label).
>
> The speed at which the drive is spinning. You have to remember
> what the 24X speed of your drive designates. 1X CDs transfer
> data at approx. 150KBps. A 24X CD transfers data at up to
> 3,600KBps, a 24 fold increase! Hence when you're playing a
> game on a Constant Linear Velocity (CLV) drive, the CD can
> be spinning up to 24 times faster than if you were listening to
> a music CD, which is fixed at 1X.
The 24X isn't a CLV drive, is it? If so, then it spins REALLY fast. A 1X
drive spins at 200 RPM to 530 RPM, so a 24X drive would be 4800 RPM to
12,720 RPM.
If the 24X is a CAV (Constant Angular Velocity) drive--that is, if 24X is
its *maximum* transfer speed, not a *constant* transfer speed--then it would
be spinning at 4800 RPM.
At these speeds, a CD doesn't have to be very far off balance to vibrate
loudly.
In the ThinkPad Configuration utility, there is a setting where you can slow
down the CD drive to run quieter. For most purposes, you don't need its
maximum speed.
-Mike
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