From: Bruce Markowitz (scosgt_at_worldnet.att.net)
Date: Sat Nov 03 2001 - 14:05:16 EST
Sometimes the top cover gets bent a bit and hits the CD as it spins. Try
taking it out with the door open and bending the sheet metal top up a bit.
You might even be able to see where it is too tight.
----- Original Message -----
From: "Michael Geary" <Mike_at_Geary.com>
To: <James_at_thinkpads.com>; "Kevin Jarrett" <kevin_jarrett_at_hotmail.com>;
<THINKPAD_at_cs.utk.edu>
Sent: Saturday, November 03, 2001 10:26 AM
Subject: RE: [600X] CD is LOUD!
> > > 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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