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.
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Errors total
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Num: 115300391
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Errors (Loudness) dB(A)
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Num: 582453
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Avg: -29.0 dB(A)
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Max: -7.2 dB(A)
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Error Muting Samples
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Num: 76691
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Avg: 1.4 Samples
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Max: 3584
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Skips Samples
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Num: 355
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Avg: 44.0 Samples
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Max: 2934 Samples
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C2 accuracy
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50%
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Total Test Result
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52.5 points (of 100.0 maximum)
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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.
- ABEX TCD-721R
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Errors total
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Num: 1075712
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Errors (Loudness) dB(A)
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Num: 57542
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Avg: -74.3 dB(A)
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Max: -14.3 dB(A)
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Error Muting Samples
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Num: 3516
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Avg: 1.1 Samples
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Max: 95 Samples
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Skips Samples
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Num: 1
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Avg: 6.0 Samples
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Max: 6 Samples
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C2 accuracy
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99.7 %
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Total Test Result
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72.9 points (of 100.0 maximum)
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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).
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Errors total
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Num: 43819
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Errors (Loudness) dB(A)
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Num: 202
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Avg: -19.6 dB(A)
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Max: -10.6 dB(A)
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Error Muting Samples
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Num: 8
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Avg: 3275.4 Samples
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Max: 3584 Samples
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Skips Samples
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Num: 0
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Avg: 0.0 Samples
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Max: 0 Samples
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C2 accuracy
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50.0 %
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Total Test Result
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81.5 points (of 100.0 maximum)
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- Conclusion
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Test Disc
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Reading Speed
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Score
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EAC CD-R
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Max
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52.5
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ABEX TCD-721R
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72.9
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ABEX TCD-726
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81.5
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Average Score
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68.96
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Test Disc |
C2 Accuracy |
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EAC CD-R |
50% |
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ABEX TCD-721R |
99.7% |
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ABEX TCD-726 |
50% |
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.
