Re: [ARSCLIST] CD-R error rates

[George Brock-Nannestad <pattac@xxxxxxxx>]

From: Patent Tactics, George Brock-Nannestad

Hello, again,

I am sorry, but neither Parker Dinkins nor Jerry Hartke have answered my 
question, which may be summarized as: what are the deviations in measurements 
on the same disc, same diagnostic system, but different placement of the CD 
on the hub. 

All that was given was otherwise useful information that warm-up may be 
important.

Kind regards,


George

P.S. We have just bought new bathroom scales, 100 g resolution. However, 
stepping up, down and up again sometimes gives a deviation of 500 g between 
measurements. We are not going to hang on to these scales.

---------------------------------------------

> Our high-end Clover system gives very consistent results, and results
> closely agree with Philips calibration discs. Warm-up time is negligible -
> just long enough for a cup of coffee. The test drive uses a very reliable
> Philips pickup head that is no longer available.
> 
> Again, there are no "typical" results for testers. Each one is different,
> and reflects the nature of the test drive. Variations are by manufacturer,
> by model number, and even by serial number.
> 
> Jerry
> 
> > -----Original Message-----
> > From: Association for Recorded Sound Discussion List
> > [mailto:ARSCLIST@xxxxxxx] On Behalf Of George Brock-Nannestad
> > Sent: Monday, January 07, 2008 12:28 PM
> > To: ARSCLIST@xxxxxxxxxxxxxxxx
> > Subject: Re: [ARSCLIST] CD-R error rates
> > 
> > From: Patent Tactics, George Brock-Nannestad
> > 
> > Jerry Hartke commented on Parker Dinkins, and I have a query:
> > 
> > ----- has anybody tried to perform two or more consecutive tests on the
> > same
> > tester under two conditions: 1) do not cause any change of the position
> of
> > the CD on the hub (merely run the test several times) and 2) open and
> > close
> > the drawer or physically rotate the CD on the hub by a known amount?
> > 
> > Mechanical drive problems or at least the range to be expected in any
> test
> > should be demonstrated that way.
> > 
> > Kind regards,
> > 
> > 
> > George
> > 
> > 
> > Jerry:
> > > Even expensive testers can give different results. Although software
> can
> > > cause differences, the culprit is usually the drive. Anyway, E12 and
> E22
> > > error rates are far more important because they represent errors that
> > are
> > > approaching an uncorrectable state, and can result in read failure
> after
> > > degradation caused by handling and storage.
> > 
> > >
> > > >
> > > > on 1/7/08 12:37 AM US/Central, Richard L. Hess at
> > > arclists@xxxxxxxxxxxxxxx
> > > > wrote:
> > > >
> > > > > So, looking at it this way, what is an acceptable C1 rate for
> audio?
> > > >
> > > > Maximum of 220 errors per second, according to the inventors.
> > > >
> > > > > What are others getting?
> > > > >
> > > > > I had a client ask me how I was burning CDs earlier this year.
> They
> > > > > have some flavour of Clover analyzer and my CDs were showing lower
> > > > > error rates than their in-house CDs--that was a pleasant surprise!
> > > >
> > > > Plextor/Plextools can be somewhat misleading as a test platform. The
> > > > errors
> > > > on our Stagetech EC2 run two to four times higher for the same
> discs.
> > > >
> > > > --
> > > > Parker Dinkins