Re: Storage media lifetimes


<dom@xxxxxxxxxxxxxxxxx> wrote in message news:1137033608.786488.122660@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
SNIP
The DVD-R in question was initially readable after burning.

That would only tell you that the data could be read, with an unknown amount of error correction(!)

Although an immediate verification failure would be a significant warning towards media incompatibility, if you want to get a bit more assurance you'll need a better tool than simply rereading the file.

On recorders that report it, the amount of error detection and correction can be obtained with a software tool. The relative amount, and severity, of the errors detected will indicate the suitability of the media for the specific recorder at a specific writing speed. It will then over time indicate the deterioration rate, and provide a warning for imminent (even if not show-stopping yet at the moment) disasters.

For a simple test application you could use
<http://www.cdspeed2000.com/go.php3?link=download.html>
Variations in read speed are a first indication of trouble ahead, and reports of C1/C2 errors give better/quantifiable clues.

"Plextor" recorders (don't know if that applies to all models) come with a PlexTools Pro application that allows to do more in depth testing. They also list compatibility of media with their drive models at
<http://www.plextor.be/technicalservices/technology/cdrmedia.asp?choice=Supported%20media> ..

That will allow to have an initial, and ultimately a final warning, tool before having to resort to data recovery tools such as e.g. <http://www.smart-projects.net/isobuster/> and <http://www.infinadyne.com/cddvd_diagnostic.html>.

Bart 

.

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