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

Thursday, June 29, 2006
NEC ND-4571A

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: 2199738
Errors (Loudness) dB(A)
Num: 91135
Avg: -73.1 dB(A)
Max: -18.0 dB(A)
Error Muting Samples
Num: 6458
Avg: 1.1 Samples
Max: 40 Samples
Skips Samples
Num: 0
Avg: 0.0 Samples
Max: 0 Samples
Total Test Result
75.5 points (of 100.0 maximum)
C2 Accuracy
99.9 %

A normal performance was reported while testing the drive with the 721 test media. The error total, Muting Samples and Skiped samples report an average performance.

- ABEX TCD-726

Errors total
Num: 87750
Errors (Loudness) dB(A)
Num: 46930
Avg: -85.8- dB(A)
Max: -48.3 dB(A)
Error Muting Samples
Num: 685
Avg:1.0 Samples
Max: 2 Samples
Skips Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Total Test Result
78.2 points (of 100.0 maximum)
C2 Accuracy
100 %

Not used to these kind of results, as most of the market drives tend to achieve a total 100% while reading the 726 test media. In this case the 78.2 points indicate a good but not best CD error correction mechanism.

- 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
NEC ND 4571A
5/5
5/5
5/5
0/5
0/5

Average performance reported, with the drive managing to reach the third error level flawlessly, as from the fourth and up, audible clicks were present, thus the drive could not reproduce the test media.




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