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

[Jeff Hubbs]

Well, CTV would be more pedantically correct than CLV.  But yes, if
the drive is running at constant speed, the data rate should increase
as the radius increases.

On Wed, Mar 4, 2009 at 11:53 AM, Devnull <devnull at iamdevnull.info> wrote:
> On Wed, Mar 4, 2009 at 10:57, Jeff Hubbs <jeffrey.hubbs at gmail.com> wrote:
>> *Audio CDs* practice Constant Tangential Velocity in playback.  For
>> data CDs, it's more arbitrary; my understanding was that a "52x"
>> CD-ROM drive is only 52x at or near the outer edge, where the drive's
>> maximum rotational speed corresponds to the highest data rate.  It's
>> reasonable to say that CDs of all sorts have a constant tangential
>> data density independent of radius.
>
> I am not all that familiar with Constant Tangential Velocity, from
> what you have described here, I am guessing that it is similar to
> Constant Linear Velocity. Since the CD under testing was a data CD,
> does that mean that Jim was correct, insofar as the CD drive spins at
> the same constant physical speed during the entire read process. If
> that is correct, then it would be dependent on some pi-based function,
> right?
>
>> I recall that we've at least one person on the list who has had a CD
>> shatter under load inside a drive.  I have had a CD *eject* at speed
>> once.  I ran.
> (!)
>
> --
> -
> /dev/null
> We are the Pentium of Borg. Division is futile. You will be approximated.
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