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

Thursday, June 09, 2005
Teac DV-W516GB

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: 5810465
Errors (Loudness) dB(A)
Num: 85365
Avg:-54.2 dB(A)
Max: -11.7 dB(A)
Error Muting Samples
Num: 18084
Avg: 1.9 Samples
Max: 746 Samples
Skips Samples
Num: 1887
Avg: 8.1 Samples
Max: 576 Samples
Total Test Result
55.0 points (of 100.0 maximum)
C2 Accuracy
60.4 %

An extremely high total error count, one of the highest we have seen. The maximum error loudness level is also high at -11.7 dB(A). However, the skipped sample count of 1887 is truly woeful and it is no surprise that the drive has managed a total test result score of only 55.0 points out of 100.

- ABEX TCD-726

Errors total
Num: 0
Errors (Loudness) dB(A)
Num:0
Avg: 0 Samples
Max: 0 Samples
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
TEAC DV-W516GB
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 performance with the specific test disc. 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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