Re: 24 speed -- aint that fast

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#201

From: Patrick I Taylor
Date: Fri, 01 Feb 2002 17:26

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lacunae wrote:

> also, you need to look at the method your drive uses for
> changing speeds.  since cds are burned from the inside track
> out, the speeds are lower at the beginning of the disc than
> at the end.   you should see a better increase (average speed)
> if you burn a longer cd (650-700MB)

that's just wrong.  the 'speed' (RPM) changes to maintain
constant linear velocity, which translates to constant
bitrate.  a 24x drive is going to rotate at 24 times the
speed (approx) of a 1x drive both at the inside and
the outside of the spiral, always maintaining enough
linear velocity to keep up with (24x150kb/sec).

The reason that you get better bitrates on longer burns
is that the set-up time at the beginning of the burn is
less of a percentage of the entire burn.  This setup time
is not proportional to your speed multiplier.  If you start
counting seconds from the point that the actual track
writing begins it should be the same, excluding rounding
errors.  Also there is the session closing time at the
end to consider, which is not exactly proportional to
speed either.

Pt

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From: Patrick I Taylor <pataylor@nortelnetworks.com>
Newsgroups: alt.comp.periphs.cdr,aus.computers.cdrom,comp.publish.cdrom.hardware,comp.publish.cdrom.multimedia,comp.publish.cdrom.software
Subject: Re: 24 speed -- aint that fast
Date: Fri, 01 Feb 2002 11:26:19 -0600
Organization: Nortel
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