![]() ![]() So, if I was copying an important DVD full of data I'd copy it on 1-2x speed and write it at the same slow speed, and then CRC checksum both. I store all my music on hard disk and it really is quite scary how often the ripping software will re-rip a track because the twice that it did it didn't end up with the correct / same checksum. ![]() If you use 'high end' CD ripping software (for making digital copies of CDs) then different drives will have different errors on the data read - its quite shocking really and there are now databases of 'CRC's (i.e a checksum of the whole track) for automated ripping software to check that the read was correct. This is fine with music/video as you won't hear/see small errors - but not good with data such as maps and routing information. Writable/re-writable DVDs (and CDs) reflect light less well than an original disk, so are harder to read if anything is a bit dirty, and of course a car vibrates and tends to be relatively dirty.Īlso, copies are not always perfect, especially when read at high speed and written at high speed. ![]()
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