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Improve "verify files" speed by hashing source files.

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I noticed during the verify phase when I was burning 4GB to DVD from an USB external hard drive that the source files were being re-read.

If "verify files" is checked, I suggest hashing (MD5/SHA-1/whatever) the source files during burn and hashing the files on the DVD-R/CD-R and comparing that during verify instead of rereading the source file bytes.

This may be less of a problem with most machines now running SATA, but if the source data and burner are on the same IDE channel I'd expect a speed improvement.

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