Posted by Citizen Bob on 12/11/06 16:29

On Sun, 10 Dec 2006 20:39:37 +0100, Robert Roland <fake@ddress.no>
wrote:

>>I am looking to use Nero to Verify a previous burn on a separate run.
>>The only way I can get Nero to perform a Verify is to include it as
>>part of the burn process. I want to be able to run Verify alone
>>without any burn process.

>The short answer is: You can't.

That's what I suspected.

>The longer answer is: When Nero (or any other recording software)
>burns files to disc, it creates the ISO data structure in RAM or a
>temp file, and then sends that data to the recorder. If you create
>another ISO image, you are not guaranteed that the image is bit-by-bit
>exactly identical to the first, even if it contains the same files in
>the same order. The process of creating the ISO data structure is not
>100% predictable, so there is no way to reliably recreate the ISO
>image to verify against.
>
>>I can use any other application - it doesn't have to be Nero.
>
>You can, of course, read back all the files and compare them to the
>original files.
>
>If you create an ISO file on the hard disk and then burn that, you
>might be able to verify the recorded disc against the ISO file. I have
>not tried this, nor have I checked if Nero supports it, but it is, at
>least, technically possible.

If I copy an AVI file to the hard disk and then burn it as a Data Disc
with Nero, it will end up as an AVI on the target. I should be able to
use a file comparison utility to see if the two files are the same.

The same should be true for an MPEG-2 burn only then I would have to
compare the entire VIDEO_TS directories.

If I have an ISO as you suggest then I would use WinRAR to extract the
content and do the comparison. However in that case there is the
possibility that Nero will monkey with the VOBs and other files, so I
will have to experiment.

I only use Nero to copy AVIs so I think I am covered with QVerify.




--

Government's view of the economy could be summed up in a
few short phrases: If it moves, tax it. If it keeps moving,
regulate it. And if it stops moving, subsidize it.
--Ronald Reagan

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