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Home > Hardware Reviews > Optical Storage > DVD Recorders Double Layer

Tuesday, April 05, 2005
AOpen DUW1608/ARR

3. CD Error Correction Tests

In the following tests, we check the drive's behavior when it comes to reading scratched / defective discs. The test discs we use are the ABEX series from ALMEDIO.

- ABEX TCD-721R


Errors total
Num: 897874
Errors (Loudness) dB(A)
Num: 41421 Avg: --73.8 dB(A) Max: -19.1 dB(A)
Error Muting Samples
Num: 2236 Avg: 1.1 Samples Max: 78 Samples
Skips Samples
Num: 0 Avg: 0 Samples Max: 0 Samples
Total Test Result
77.2 points (out of 100.0 maximum)
C2 Accuracy
97.4 %

The total error count was low, and although the maximum error loudness is high, from the graph we can see that performance is generally good. The error and muted samples are quite low while no samples were skipped. The 77.2 points out of 100 is a good score with this test disc.

- ABEX TCD-726



Errors total
Num: 678507
Errors (Loudness) dB(A)
Num: 0
Avg: -174 dB(A)
Max: -174 dB(A)
Error Muting Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Skips Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Total Test Result
100.0 points (out of 100.0 maximum)

The behavior of drive was much better in this case where it managed to correct all the disc's errors. The result was a perfect 100.

- CD-Check Audio Test Disc

The CD-Check Test Disc is a very useful tool for evaluating the Sound Reproduction / Error correction capabilities of a CD player. The disc offers a signal combination with disc error patterns to rate the drive's ability to read music and reproduce it completely. Five tracks on the disc contain a sequence of progressively difficult tests. These tracks are referred as Check Level -1 through Check Level -5.

The tracks are reproduced (played) through a software multimedia player (i.e. Windows Media Player). Each level is considered as passed, if the tone coming out from the speakers is smooth, continuous without interruptions, skipping or looping. The higher the Check Level passed, the more reliable the sound reproduction of the tested device.

Error Level
1
2
3
4
5
AOpen DUW1608/ARR
5/5
5/5
5/5
0/5
0/5

The drive passed only the first three Check Levels of the test. The performance reveals average sound reproduction and error correction. The fourth and the fifth levels include an error size of 1.125mm and 1.500mm respectively and the drive produced continues audible clicks over those tracks.




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