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

Friday, December 16, 2005
Plextor PX-750A

3. CD Error Correction Tests

In the following tests, we check the drive's behavior when reading scratched / defective audio discs. The test discs used were the ABEX series from ALMEDIO.

- ABEX TCD-721R

Errors total Num: 923445
Errors (Loudness) dB(A) Num: 53083 Avg: -74.5 dB(A) Max: -8.1 dB(A)
Error Muting Samples Num: 2936 Avg: 1.1 Samples Max: 89 Samples
Skips Samples Num: 2 Avg: 6.0 Samples Max: 6 Samples
Total Test Result 71.8 points (of 100.0 maximum)
C2 Accuracy 99.5 %

According to the table and the graph above, the overall performance with the specific disc is quite good. The total error count is low but there were skipped samples. The reported maximum error loudness of -8.1 dB(A) is very high, however this was just one of very few spikes generated. The total test result score of 71.8 points is good.

- ABEX TCD-726

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 Samples Max: 0 Samples
Total Test Result 81.5 points (of 100.0 maximum)

This is a much easier test disk than the previous one and most drives pass this test with a near perfect score, something that the PX-750A didn't do. The total test result score of 81.5 out of 100 is not as good as would expect from a Plextor drive.

- 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 abilities to read music and reproduce it completely. Five tracks on the disc contain a sequence of progressively more difficult tests. These tracks are referred to as Check Level-1 through Check Level-5.

The tracks are reproduced through a software multimedia player (i.e. Windows Media Player). Each level is considered as passed, if the tone is smooth, continuous without interruptions, skipping or looping. The higher the Check Level passed, the more reliable the sound reproduction of the tested drive.

Error Level 1 2 3 4 5
Plextor PX-750A
5/5 5/5 5/5 5/5 0/5

With this test disc, the drive reported good results, achieving flawless reading with 4 out of 5 tracks. This is very good performance.

- Summary

The drive's CD error correction mechanism is fair but disappointing for a Plextor drive.




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