alexnoe
23rd October 2003, 14:22
Tests:
- recording on 3 different recorders and analysing error rate, tracking , HF signal and jitter (they gave a 'score' for error rate and HF signal for each of the 3 recorders, and one for tracking, resulting in 7 categories where to give score). '--' = very bad, '++' = very good, '0' = somewhere between good and bad...
- recording RW discs 10 times, where they wrote k*400 MB in the k-th rewrite cycle
- rewriting 400 MB 1000 times and then check error rate
Results:
Princo 2x DVD-RW
The PI sum 8 max was far over 1000, the jitter was unbelievably high, and the HF signal unbelievably bad. They gave 7x '--'.
That means, when speaking about "DVD-RW" discs, those will be excluded...
DVD±R
As always, a few -R are good (MCC, TY, TDK etc), and a lot of the really cheap and bad stuff (Princo, LeadData...).
For DVD+R, there was no real crap. Out of the tested discs, 4x MCC discs could be recorded at 8x at pretty good quality, while Ricoh discs resulted in very poor recording quality at 8x. Well, this can happen when hacking 8x writing to 4x discs...
Among the tested +R media was only Ricoh, TY and MCC, but none of the newer cheap stuff. Maybe the save that for the next test...
DVD±RW
When recording the discs with k*400 MB in the k-th pass, 4x+RW recording failed for all discs (quote: 'We have never ever seen such bad error rates and jitter values on any test discs'). Only the Philips +RW discs had an error rate which was within the specs after that, but still far too high for 10 rewrite cycles. The laser power was appearently not properly adjusted for parts of the discs that have been used more or less often. However, if I read it correctly, they used only the Plextor drive for this test, so it could be that its firmware is b0rked.
DVD-RW discs did not show this problem, except for Princo of course.
The following discs could be written 1000 times with acceptable or good error rate:
MCC -RW
TDK -RW
The following discs could be written 1000 times, but with bad error rates at the end
Ricoh +RW ('Ricoh')
Philips +RW
The following discs failed before 1000 times
TDK +RW ('Ricoh')
Ritek -RW ('PrimeOn')
- recording on 3 different recorders and analysing error rate, tracking , HF signal and jitter (they gave a 'score' for error rate and HF signal for each of the 3 recorders, and one for tracking, resulting in 7 categories where to give score). '--' = very bad, '++' = very good, '0' = somewhere between good and bad...
- recording RW discs 10 times, where they wrote k*400 MB in the k-th rewrite cycle
- rewriting 400 MB 1000 times and then check error rate
Results:
Princo 2x DVD-RW
The PI sum 8 max was far over 1000, the jitter was unbelievably high, and the HF signal unbelievably bad. They gave 7x '--'.
That means, when speaking about "DVD-RW" discs, those will be excluded...
DVD±R
As always, a few -R are good (MCC, TY, TDK etc), and a lot of the really cheap and bad stuff (Princo, LeadData...).
For DVD+R, there was no real crap. Out of the tested discs, 4x MCC discs could be recorded at 8x at pretty good quality, while Ricoh discs resulted in very poor recording quality at 8x. Well, this can happen when hacking 8x writing to 4x discs...
Among the tested +R media was only Ricoh, TY and MCC, but none of the newer cheap stuff. Maybe the save that for the next test...
DVD±RW
When recording the discs with k*400 MB in the k-th pass, 4x+RW recording failed for all discs (quote: 'We have never ever seen such bad error rates and jitter values on any test discs'). Only the Philips +RW discs had an error rate which was within the specs after that, but still far too high for 10 rewrite cycles. The laser power was appearently not properly adjusted for parts of the discs that have been used more or less often. However, if I read it correctly, they used only the Plextor drive for this test, so it could be that its firmware is b0rked.
DVD-RW discs did not show this problem, except for Princo of course.
The following discs could be written 1000 times with acceptable or good error rate:
MCC -RW
TDK -RW
The following discs could be written 1000 times, but with bad error rates at the end
Ricoh +RW ('Ricoh')
Philips +RW
The following discs failed before 1000 times
TDK +RW ('Ricoh')
Ritek -RW ('PrimeOn')