I have a DW1640 for a few months connected to my computer through a USB2.0 external case. Everything was working OK, except for some few coasters I made (with detected CRC read error, unreadable disk, …)
I am used to check the DVDs/CDs I burn, with a global file compare program. For the first time today, I got an error comparing one big binary file on the DVD ISO and the original one on my hard drive. It was a “one bit” error, somewhere in the file: a 0xD5 was on the DVD, instead of a 0xD4. I burned again the whole ISO (it was on a DVD+RW, already used several times) and no error this time.
What I find very strange is that when there is something wrong when burning a CD/DVD, it is detected by the CRC checks and give a nice “unable to read file due to cyclic redondancy check error” and you cannot read the file. This time it looks that the CRC written on the DVD was already computed by the drive with the error in the file…
So is this kind of “undetected error” (unless you compare the files bit per bit) expectable from a DVD burner? Where did the error appear : In the USB interface ? In the burner ? In the computer ? (for the last one, I haven’t got any error like that at all, while transferring GBytes of data, memory modules are fully tested, …), or even in the CD/DVD burning software (Nero) ?
Thanks in advance for the tips,