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Checksum Question

Movie Junkie

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First, let me set the scenario;


1. Take a DVD and make an ISO from it. Write that ISO back to a blank disc.


2. Now take another DVD of the same title (everything is the same, title, company that put it out, catalog number etc.) and make an ISO from it using the same program that you used to make the original ISO.


3. Now, using the same program, make an ISO from the disc you burned in step 1.


Assuming that you had no read or write errors at any time if you do a checksum on the two ISOs should the checksum be the same for both of them?

Edited by Movie Junkie
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The ISO's taken from the original discs should be the same. The one from the burnt disc might be different if the burning tool changed something during the burn.


Also, reading back from a burnt disc will not always produce an image the exact same size as the one you burnt. Drives often round up to the nearest 16 for the overall size of the disc.

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