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Home > Hardware Reviews > Optical Storage > DVD Recorders 1-4x

Sunday, May 11, 2003
Panasonic LF-D521 DVD-RAM

4. CD Error Correction Tests

Panasonic LF-D521 IDE DVD-RAM - Page 4

CD Error Correction Tests

In the following tests we examined the error correction capabilities of the Panasonic LF-D521, when reading an artificially damaged CD-R. For the test we used the Almedio ABEX pressed discs, and the EAC test disc.

- EAC CD-R Test Disc

The EAC test disc is always hard to read for all the drives we have tested. The Panasonic LF-D521 reported many errors and some of them were muted. The number of skipped samples was also high resulting to an overall score of 52.5 points out of 100.
Errors total
Num: 115300391
Errors (Loudness) dB(A)
Num: 582453
Avg: -29.0 dB(A)
Max: -7.2 dB(A)
Error Muting Samples
Num: 76691
Avg: 1.4 Samples
Max: 3584
Skips Samples
Num: 355
Avg: 44.0 Samples
Max: 2934 Samples
C2 accuracy
Total Test Result
52.5 points (of 100.0 maximum)

The C2 accuracy reported is only 50%. We cannot come up with safe conclusions by this test only, but the first impression is that the Panasonic LF-D521 cannot retrieve C2 error information accurately.


Errors total
Num: 1075712
Errors (Loudness) dB(A)
Num: 57542
Avg: -74.3 dB(A)
Max: -14.3 dB(A)
Error Muting Samples
Num: 3516
Avg: 1.1 Samples
Max: 95 Samples
Skips Samples
Num: 1
Avg: 6.0 Samples
Max: 6 Samples
C2 accuracy
99.7 %
Total Test Result
72.9 points (of 100.0 maximum)

The score for the Panasonic drive is 72.9, still an average performance. The total errors were less than in the previous test, as it was expected. The average level of the Loudness errors is -74.3dB(A).

This time the C2 accuracy reported is high. The ABEX 721R is a pressed test disc and easy to read, compared to the EAC disc in the previous test.

- ABEX TCD-726

The total amount of errors is smaller in the case of the TCD-726 disc. The scratches on the disc is not as heavy as in the TCD-721, and the rest defects and fingerprints seem not to produce many errors while reading. The Loudness errors were 202 and the average level was -19.6dB(A), which is an acceptable level. Although only 8 samples were muted, their average length was high. The score for this test is the best we had for the Panasonic drive. (81.5 points).

Errors total
Num: 43819
Errors (Loudness) dB(A)
Num: 202
Avg: -19.6 dB(A)
Max: -10.6 dB(A)
Error Muting Samples
Num: 8
Avg: 3275.4 Samples
Max: 3584 Samples
Skips Samples
Num: 0
Avg: 0.0 Samples
Max: 0 Samples
C2 accuracy
50.0 %
Total Test Result
81.5 points (of 100.0 maximum)

- Conclusion

Test Disc
Reading Speed
Average Score

Test Disc
C2 Accuracy

The Panasonic LF-D521 gets an average score of 68.9 points out of 100 at our CD error correction tests.

On the other hand, the C2 accuracy seems to be low in most cases.

CDSpeed Advanced DAE quality test
- ABEX 721R

According to the Nero test, the quality score for Panasonic LF-D521 is only 42.3 points, while the C2 accuracy is rather low (73.43%). The main reason for this result is the increased amount of compare errors, and the 1562 sync errors that were reported.

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