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

Sunday, May 18, 2003
4x DVD+RW Roundup (Plextor PX-504A, Mitsumi DW-7801TE)

4. CD Error Correction Tests - Mitsumi DW-7801TE

4x DVD+R/RW Roundup - Page 4

CD Error Correction Tests

Mitsumi DW-7801

In the following tests we examined the error correction capabilities of the Mitsumi DW-7801TE, 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 Mitsumi drive reported many errors and some of them were muted. The number of skipped samples was also high resulting to an overall score of 52.3 points out of 100.
Errors total
Num: 116273155
Errors (Loudness) dB(A)
Num: 608319
Avg: -30.6 dB(A)
Max: -7.2 dB(A)
Error Muting Samples
Num: 84361
Avg: 1.2 Samples
Max: 622
Skips Samples
Num: 433
Avg: 37.9 Samples
Max: 2934 Samples
C2 accuracy
50.5%
Total Test Result
52.3 points (of 100.0 maximum)

The C2 accuracy reported is only 50.5%. We cannot come up with safe conclusions by this test only, but the first impression is that the Mitsumi DW-7801TE cannot retrieve C2 error information accurately.

- ABEX TCD-721R

Errors total
Num: 916017
Errors (Loudness) dB(A)
Num: 48471
Avg: -73.1 dB(A)
Max: -6.7 dB(A)
Error Muting Samples
Num: 3061
Avg: 1.1 Samples
Max: 40 Samples
Skips Samples
Num: 16
Avg: 6.0 Samples
Max: 6 Samples
C2 accuracy
99.1 %
Total Test Result
67.7 points (of 100.0 maximum)

The score for the Mitsumi drive is 67.7, 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 -73.1dB(A).

This time the C2 accuracy reported is higher than in the previous test, but it is away from 100%. 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 only 20 and the average level was -48.4dB(A), which is an acceptable level. Only 2 samples were muted, and their average length was low. The score for this test is the best we had for the Mitsumi drive. (88.2 points).

Errors total
Num: 6
Errors (Loudness) dB(A)
Num: 20
Avg: -48.4 dB(A)
Max: -31.1 dB(A)
Error Muting Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Skips Samples
Num: 2
Avg: 6.0 Samples
Max: 6 Samples
C2 accuracy
100.0 %
Total Test Result
88.2 points (of 100.0 maximum)

- Conclusion

Test Disc
Reading Speed
Score
EAC CD-R
Max
52.3
ABEX TCD-721R
67.7
ABEX TCD-726
88.2
Average Score
69.4

Test Disc
C2 Accuracy
ABEX TCD-721R
99.1%
ABEX TCD-726
100%

The Mitsumi DW-7801TE gets an average score of 69.4 points out of 100 at our CD error correction tests. The drive can be a good reader with not heavily defected discs, as we saw in the ABEX-726 test, but cannot correct adequately severe errors coming from wide scratches.

On the other hand, retrieving of C2 information is not 100% accurate.

CDSpeed Advanced DAE quality test
- ABEX 721R

According to the Nero test with the ABEX TCD-721R, the quality score for Mitsumi DW-7801TE is 68.2 points, while the C2 accuracy is rather low (77.65%). The main reason for this result is the increased amount of compare errors, and the 957 sync errors that were reported.




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