[sdiy] OT: Scratchy CDs

[Michael Boracci]

Directly from OSTA.org Very interesting indeed.

Does using lower CD-R recording speeds and lower capacity media produce
better sounding discs?

"High speed CD-R writing often creates discs with low I3 and I11 signal
amplitudes (optical signals generated from the smallest and largest marks)
and 80 minute discs achieve their capacity by packing marks and lands more
tightly together. These result in reduced recording and playing margins and
sometimes lead to perceptible sound degradation, especially in older CD
audio players which may not employ equalization (signal boosting).
Consequently, many high speed recorder manufacturers recommend creating
audio discs at reduced writing speeds while some recorders even limit their
maximum speed to 24x when writing audio discs. In addition to slower
recording speeds, some manufacturers also suggest using 74 minute instead of
80 minute discs. Several of the latest recorders even offer special writing
modes which record audio discs with longer marks and lands than would
normally be the case, albeit at the expense of some capacity. For example,
an 80 minute disc written with longer marks and lands might only hold 74
minutes of audio and a 74 minute disc just 68 minutes of material."

This would lead me to believe that burning data Cds is different than
burning cds for audio. I know that there are drives out there that have that
special audio CD mode available. That may be a worthwhile investment at some
point.

MB

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Jilt van Moorst
Sent: Tuesday, September 23, 2003 5:16 PM
To: music.maker at gte.net; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] OT: Scratchy CDs


ok destruction was definitely too strongly put, but I did a little
searching as I was sure I had heard something like this

http://www.google.com/search?num=100&hl=en&lr=&ie=ISO-8859-1&q=%22The+physic
s%2C+chemistry+and+thermodynamics+of+the+recording+process%22&btnG=Google+Se
arch

excuse the long url, but this quote seems to come from either maxell or
OSTA (Optical Storage Technology Association)

"The physics, chemistry and thermodynamics of the recording process seem to
produce more consistent and readable marks within the CD-R recording layer
when the recording speed is 2X or higher. This may be due to the annealing
process of pit formation at 1X where the heat caused by the laser remains
focused on the pit for a longer time."

I know of both the case for slow audio burning and there is supposedly a
case for faster burning, so I'm still not sure what the optimum speed is,
always felt CD burning was the last voodoo factor in computing..

Jilt van Moorst

At 11:17 AM 9/23/2003 -0800, Scott Gravenhorst wrote:
>I would rather imagine that a "sweet speed" would probably depend on the
>manufacturer of the drive and even the model within their selection of
>drives.  I would expect cheaper drives to perform more poorly.  BTW, I
don't
>doubt your research, but I had never before heard of CDR being destroyed by
>burning at 1X.
>
>Also, this has been a very informative OT thread.  In fact, since many/most
>of us record music (DIY) one might even say that it was never OT in the
first
>place.
>
>Thanks list...
>
>Jilt van Moorst <jilt at robotfunk.com> wrote:
> >OK this was certainly true a few years ago, when 4x burning was 'pretty
> >darn fast' but in the 52x age you can actually destroy your cd's by
> >overheating them when burning that slow, most recent burners won't allow
> >such low speeds anyway. I'd like to see some updated reports on the
current
> >audio burning speed sweet spot .
> >
> >Jilt van Moorst






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