Re: [ARSCLIST] CD-R error rates

[Jerry Hartke <jhartke@xxxxxxxxxxxx>]

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