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Cyclic Redundancy Error on CD/DVD
Carol Haynes:
I would have thought CRC checks are more difficult than just wear and tear - it means that the data is readable but isn't consistent with what should have been recorded. (CRC is a caclculated number form the data that is recorded with the file - when reading it is recalculated and compared to what it should be.) It probably means the disc was originally recorded with errors.
One of the reasons I always verify optical discs when I burn them - so that I know source data and optical disk match.
ewemoa:
Sounds prudent :up:
When I feel I have the time, in addition to verifying, I have also used SearchMyFiles with the Non-Duplicates Search option to compare the file content on the burned media with the source file content. Perhaps a bit extreme, but IIUC it can catch some (hopefully unlikely) problems such as a file not getting placed within an ISO appropriately.
Target:
Sounds prudent :up:
When I feel I have the time, in addition to verifying, I have also used SearchMyFiles with the Non-Duplicates Search option to compare the file content on the burned media with the source file content. Perhaps a bit extreme, but IIUC it can catch some (hopefully unlikely) problems such as a file not getting placed within an ISO appropriately.
-ewemoa (July 05, 2012, 04:24 AM)
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most 'decent' burning apps (I use ImgBurn) these days should include the option to verify a new disc as part of the process.
Where there's any doubt I also use CD Check
ewemoa:
I also use ImgBurn (very nice app!) and as I understand it, it's currently set up here to perform this sort of verification.
Are you familiar with the details of ImgBurn's verification process? I don't know exactly what it does.
My impression is that this doesn't necessarily end up being equivalent to ensuring that the files you started with (e.g. pre-ISO creation) are what ends up burned on the disc, since there may be an intermediate step of creating an ISO (which is what I tend to do).
Even if ImgBurn does a good job, I may have failed to properly construct the ISO :)
Target:
I also use ImgBurn (very nice app!) and as I understand it, it's currently set up here to perform this sort of verification.
Are you familiar with the details of ImgBurn's verification process? I don't know exactly what it does.
My impression is that this doesn't necessarily end up being equivalent to ensuring that the files you started with (e.g. pre-ISO creation) are what ends up burned on the disc, since there may be an intermediate step of creating an ISO (which is what I tend to do).
Even if ImgBurn does a good job, I may have failed to properly construct the ISO :)-ewemoa (July 05, 2012, 10:06 PM)
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hence the redundancy check with CD Check (worth noting that it doesn't do audio disks...) - it's a handy tool and you can compare against a directory or a hash file (it will also generate the hashes)
FWIW I usually include a copy of the hash file in my write
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