[sdiy] OT: Scratchy CDs

[Michael Boracci]

I would think that the highest possible burning speed would have to do with
timing accuracy of the signals that drive the laser, speed control, and
general mechanical accuracy. It has to be much more controlled in order to
write data at a faster rate, or so I think. I would also think that the
speed ( I may be wrong but aren't we talking about Constant Linear
Velocity ) control would have to be running with tighter tolerances as well.
Hence a cheap cd player relies on Error Correction to counteract tolerances
in other areas and a good Cd player needs to use less EC and gives a better
result. Going in reverse, when burning a Cd your goal is to reduce the load
on the EC circuits as much as possible. I use an older 4x Yamaha SCSI burner
at 1x. It has no fancy EC and it does not compensate for vibration, so I
have it encased in Isolation foam and it has made a big difference. I use
the Ultramatch jitter remover when I go from my Korg D8 to the PC. It may
reduce errors, or not, but I have to justify that Ultramatch being in the
rack anyway.

MB

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Scott Gravenhorst
Sent: Tuesday, September 23, 2003 3:27 PM
To: synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] OT: Scratchy CDs


One minor point: A CDR contains not metal to burn, but rather an organic
dye.

Tim Parkhurst <tparkhurst at siliconbandwidth.com> wrote:
>Snip>
>> 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.
>Snip>
>
>***************************************
>Burning CDs at a slower rate heats them up more? I don't mean to sound
>disrespectful, but I seriously doubt this. Burning CDs at a slower rate
does
>not change how long the laser stays on to burn a hole in the metal, it only
>changes the rate at which data is passed along to the CD drive. I could be
>wrong on this, but I have never seen any evidence of a slower write speed
>causing the CD to get hotter. I really don't think it works that way.
>
>Tim Servo
>
>"The distance between insanity and genius is measured only by success."
>-James Bond: Tomorrow Never Dies
>
>
>
>***************************************************************************
>This message is confidential.  The information contained in
>this e-mail message is intended only for confidential use of the
>recipient(s) named above. If the reader of this message is not the intended
>recipient or an agent responsible for delivering it to the intended
>recipient, you are hereby notified that you have received this document in
>error and that any review, dissemination, distribution, or copying of this
>message is strictly prohibited.  If you have received this communication in
>error, please notify us immediately by e-mail, and delete the original
>message.
>***************************************************************************
>
>

=========================================================
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/FatMan/
-- NonFatMan: home1.gte.net/res0658s/electronics/




____________________________________________________________
Free 20MB Web Site Hosting and Personalized E-mail Service!
Get It Now At Doteasy.com http://www.doteasy.com/et/