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

Thursday, December 22, 2005
Plextor PX-755A

3. CD Error Correction

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: 1878287
Errors (Loudness) dB(A) Num: 91341 Avg: -72.4 dB(A) Max: -18.0 dB(A)
Error Muting Samples Num: 7916 Avg: 1.0 Samples Max: 26 Samples
Skips Samples Num: 1 Avg: 6.0 Samples Max: 6 Samples
Total Test Result 71.7 points (of 100.0 maximum)

The error total count is very high and there seem to be a lot of spikes hovering around the -18.0dB to -24-dB range. Despite this, there was only one skipped sample and the drive managed a respectable score of 71.7.

Errors total Num: 0
Errors (Loudness) dB(A) Num: 0 Avg: -174.0 dB(A) Max: -174.0 dB(A)
Error Muting Samples Num: 0 Avg: 0 Samples Max: 0 Samples
Skips Samples Num: 0 Avg: 0 Samples Max: 0 Samples
Total Test Result 100 points (of 100.0 maximum)

Flawless reading with the 726 Abex series test disc.

- 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 (e.g. 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-755A
5/5 5/5 5/5 5/5 5/5

Excellent performance with the CD-Check Audio Test Disc, where the drive managed to read all the way up to the 5th error level.

- Summary

Even though the CD error correction mechanism was a little shaky with the 721 test disc, the 755A has proved a good CD reader when it comes to faulty media. Very few drives manage to read all five levels of the CD-Check Audio Test disc.




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