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Thank you Jerry for consistently providing high quality info. I attended a workshop on CD-R at which you spoke 13 years ago. IMHO, your expertise is unparalleled. Whether the subject is CD or DVD it is always a mystery to me how little mention there is, especially in the archival community, about performing as-recorded testing. I bought a Clover Systems CD analyzer for this purpose over 10 years ago and still use it. They have units for DVD too. Regardless of what is published by manufacturers one will never really know how well a given disc will work in a given drive, new or otherwise, and over time, unless one tests. It is equally amazing to me how little we hear about checksums. If one is storing files there needs to be a way of verifying that the files themselves have not changed over time. Checksums provide an easy way of doing that reliably. Thank you, Kevin Irelan