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Friday, November 22, 2002

3. CD Error Correction

Teac DV-516E IDE DVD-ROM - Page 3

Error Correction Tests

In the following tests we examine the error correction capabilities of Teac DV-516E.

- Test Results (Max Reading)

Errors total
Num: 5058159
Errors (Loudness) dB(A)
Num: 25069
Avg:-21.2 dB(A)
Max: -7.2 dB(A)
Error Muting Samples
Num: 1038
Avg: 2925.4 Samples
Max: 3584 Samples
Skips Samples
Avg: 0 Samples
Max:0 Samples
Total Test Result
71.9 points (of 100.0 maximum)

The errors within the black triangle defect, reached -7.2dB in specific areas. The average Loudness errors level is 21.2db(A). The score is 71.9 out of 100 (max), which is a medium performance.


- Test Results (Max speed)

Errors total
Num: 148445352
Errors (Loudness) dB(A)
Avg: -25.4 dB(A)
Max: -4.8 dB(A)
Error Muting Samples
Num: 58563
Avg: 1411.0 Samples
Max: 3584 Samples
Skips Samples
Num: 5
Avg: 2371.8 Samples
Max: 2939 Samples
Total Test Result
46.3 points (of 100.0 maximum)

The score for Teac DV-516E is only 46.3 points, which is a less than average performance. The total errors are more than in the previous test, as it was expected, since the disc is heavily scratched. The average level of the Loudness errors is -25.4dB(A).

- ABEX TCD-726

- Test Results (Max Speed)

Errors total
Num: 84
Errors (Loudness) dB(A)
Num: 4
Avg:-45.8 dB(A)
Max:-32.2 dB(A)
Error Muting Samples
Num: 2
Avg: 18.0 Samples
Max: 18 Samples
Skips Samples
Num: 0
Avg: 0.0 Samples
Max: 0.0 Samples
Total Test Result
91.2 points (of 100.0 maximum)

The total amount of errors only 84 with the TCD-726 disc. The scratches on the disc is not as heavy as in the TCD-721, and the rest defects and fingerprints produced only a few errors while reading. The Loudness errors were only 4 and the average level was -45.8dB(A), which is an acceptable level. The amount of error muting samples is 2 leading to a very good score of 91.2 points.

- Conclusion

Test Disc
Reading Speed
Average Score

Teac DV-516E gets an average 69.8 score out of 100 in the reading error correction tests.

- C2 Information accuracy

- Tests Results (Max Speed)

The drive was extremely slow since it slowed down the reading speed in order to read accurately. We had to stop the task after approximately 22 hours (!) as you can see from the elapsed time indication in the above picture. You can also see that the drive started to report unreadable sections (red spikes) from the 20 min of the test disc, where the scratch became larger. Assuming from the results until the moment we interrupted the process, the quality score is very low (many compare errors) and the C2 accuracy is also very low.

EAC software also gave the a very low accuracy (66.7%) in the corresponding test.

Test Disc
Reading Speed
Score (%)
Average Score

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