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

Thursday, December 08, 2005
HP840b

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: 829339
Errors (Loudness) dB(A)
Num: 49764 Avg: -74.6 dB(A) Max: -19.8 dB(A)
Error Muting Samples
Num: 2687 Avg: 1.1 Samples Max: 89 Samples
Skips Samples
Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result
76.9 points (out of 100.0 maximum)

The reported total errors is low as is the average loudness level. There were no skipped samples and in general the drive has a good CD-error correction mechanism.

- ABEX TCD-726

Errors total
Num: 2036
Errors (Loudness) dB(A)
Num: 3018 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
100.0 points (out of 100.0 maximum)

With the 726 test disc, the results were very good, with flawless reading and a perfect total test result score.

- 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
HP 840b
5/5
5/5
5/5
5/5
0/5

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

- Summary

In general, a very convincing performance with all the test discs, in most cases better than average performance. With the CD-Check Audio test disc, the results were more than satisfying, as the drive managed to playback 4 out of 5 tracks, which is considered very good performance.




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