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.
> 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
> [log in to unmask]
> > 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