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

Wednesday, January 25, 2006
BenQ DW1655

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: 1224102
Errors (Loudness) dB(A)
Num: 59435 Avg: -73.3 dB(A) Max: -32.0 dB(A)
Error Muting Samples
Num: 3823 Avg: 1.0 Samples Max: 25 Samples
Skips Samples
Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result
76.4 points (out of 100.0 maximum)

The total error count is about average, perhaps bordering on the high side but the loudness level is quite good with a maximum at -32dB(A). Muting samples are low and most important of all, no skipped samples. The total test result score of 76.4 is very good.

- 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)

Results with the 726 test disc are great, with flawless reading and a perfect total test result 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 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
DW1655
5/5
5/5
5/5
5/5
5/5

With this test disc, the drive produced excellent performance, achieving flawless reading in 5 out of 5 tracks. It has been a long time since a drive has been able to read all 5 tracks.

- Summary

The CD error correction capabilities of the DW1655 are extremely good.




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