Re: [ARSCLIST] CD Longevity

[Jerome Hartke <jhartke@xxxxxxxxxxxx>]

> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:ARSCLIST@xxxxxxx] On Behalf Of Jos Van Dyck
> Sent: Sunday, January 22, 2006 6:29 AM
> To: ARSCLIST@xxxxxxxxxxxxxxxx
> Subject: Re: [ARSCLIST] CD Longevity
> 
> Charles Lawson wrote:
> >
> >When I check the error rates using Plextor's software, I find that they
> are
> actually higher at 1X.
> >The current crop of discs appears to perform best in my drives at 4X.  8X
> is comparable.
> >I have found the worst results at 1X and above 16X.
> >
> >Charles Lawson <clawson@xxxxxxxxxxxxx>
> 
> The laser power in CD writers is adjusted to a particular media type and
> writing speed.
> Since reviewers rather tend to stress high speed capability, writing is
> usually optimised for higher speeds.
> Only few drives are optimised for 1x writing, like SONY CDU948 or CDW900
> or
> Plextor PLEXMASTER designed with pre-mastering in mind.
> 
> Audio CDR media by nature have to be 1x compatible.
> 
> >My suspicion is that at the lower speeds the dye bleeds and causes more
> errors.
> >I haven't had the chance to check this out with an electron microscope,
> yet.
> 
> Did anyone on this list perform exhaustive media testing, e.g. with
> AudioDev
> CATS system?
> 
> Jos Van Dyck
> NGM

Media Sciences has many testers for electrical parameters and errors (what
the AudioDev and other systems test), and for tilt, unbalance, eccentricity,
axial and rim runout, thickness, and center hole and rim diameter. We also
test the logical volume and file structure. Specific test results are
confidential, and belong to our clients, but we share our general
observations here.

Jerry
Media Sciences, Inc.
http://www.mscience.com/