Re: CDs, was DATs, Was Re: arsclist Duplicating casette tapes

[Jerome Hartke <jhartke@xxxxxxxxxxxx>]

Mike Richter wrote:
> 
> At 09:58 PM 8/9/2002 -0400, Steven Smolian wrote:
> 
> >When doing CDs from a number of originals for a client, and provided he
> >agrees, I make two of each- one on Mitsui, on on TY.  The Mitsuis are kept
> >for reference purposes for the odd numbered items, the TYs for the even, the
> >second copies sent to dark storage.  When one shows signs of failing, the
> >group is to be called back from storage and those on the other brand are to
> >be copied.
> 
> There's a familiar ring here. When I send a master in for pressing, I send
> two copies, one on Mitsui, the other on T-Y. In the unlikely event that one
> has a detectable error, the other would be used.
> 
> >Incidentally, when will prices drop for CD testers?  Could this be done with
> >an in-machine CD player and appropriate software?
> 
> I leave the question to experts, but I note that the best user-level
> reporting I know is with CDR Inspector. Jerry will surely have better
> information, but my belief is that no lower level can be reached with a
> conventional drive. There is an image on the CD-R side of my WWW site of a
> poor disc as reported by that program.
>     http://www.mrichter.com/cdr/bad_disc.gif
> 
> Whether that program or one of the alternatives is sufficient for your
> purposes only you can judge. CDR Inspector and its little brother, CDR
> Diagnostic, are available from
>    http://www.arrowkey.com/
> 
> Needless to say, I have no association with Arrowkey or any other vendor.
> 
> Mike
> 
> mrichter@xxxxxxx
> http://www.mrichter.com/

Most test equipment manufacturers are pressing ahead with DVD (ROM,
Recordable, ReWriteable) testers or with high speed CD testers. Prices
are $50,000 and up. Even a "cheap" tester costs $3,000 and up.

Full CD testing requires access to the signal from the pickup head and
its photodiodes. This signal is then processed in various ways by the
test equipment to give many different quality indicators.

The photodiode signal is processed very heavily in any read drive before
transfer to the host, where it is available to conventional software.
Most important quality indicators are lost during this processing.

Jerry
Media Sciences

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