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

Monday, June 28, 2004
Philips DVDRW885K DL

3. Error Correction Tests

Philips DVDRW885K Double Layer - Page 3

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: 1062767
Errors (Loudness) dB(A)
Num: 52449
Avg: -73.7dB(A)
Max:-11.5 dB(A)
Error Muting Samples
Num: 3106
Avg: 1.8 Samples
Max: 1140 Samples
Skips Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Total Test Result
76.2 points (out of 100.0 maximum)

Although the overall score for the Philips drive is not the best we have seen, the score of 76.2 points was quite acceptable, the 721R test disc being a difficult disc to read. During the error correction test, the software reported 1062767 total errors, which is about average. An average number of 1.8 samples were muted while no samples were skipped, meaning that the drive managed to process all errors.

- ABEX TCD-726

 

 

 

Errors total
Num: 0
Errors (Loudness) dB(A)
Num: 4
Avg: -94.0dB(A)
Max: -87.6 dB(A)
Error Muting Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Skips Samples
Num: 1
Avg: 185.0 Samples
Max: 185 Samples
Total Test Result
83.6 points (out of 100.0 maximum)

This test disc is usually a lot easier for drives to read and as such the final score awarded is much higher than that from the previous test disc. While the score of 83.6 is good, the better drives normally manage a perfect score of 100.

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

The tracks are reproduced (played) through a software multimedia player (i.e. Winamp, PowerDVD, Windows Media Player). Each level is considered as passed, if the tone coming out from the speakers is clear and continuous without interruptions, skipping or looping. The higher the Check Level passed, the more reliable the sound reproduction of the drive.

Error Level
1
2
3
4
5
Philips DVDRW885K
5/5
5/5
5/5
5/5
0/5

Inspite of the fact that the drive didn't manage to play the fifth track, it performed well. Note that the fifth track is very difficult for all but the best of drives to play, while most drives can't even read the fourth track.

- Summary

Test Disc
Reading Speed
Score
ABEX TCD-721R
Max
76.2
ABEX TCD-726
83.6
Average Score
79.9

The overall average score for the Philips DVDRW885K is 79.9 points out of 100.




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