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Home > Hardware Reviews > Optical Storage > DVD Recorders 8x

Wednesday, May 12, 2004

3. CD Error Correction Tests

BTC DRW1108IM DVD±RW recorder - 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.


Errors total
Num: 1327724
Errors (Loudness) dB(A)
Num: 58521 Avg: -73.0 dB(A) Max: -35.0 dB(A)
Error Muting Samples
Num: 4183 Avg: 1.0 Samples Max: 11 Samples
Skips Samples
Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result
76.4 points (out of 100.0 maximum)

The performance with this disc is good. The total error count is about average while the maximum loudness error level is quite good and there were no skipped samples. The total score is very good.

- ABEX TCD-726

Errors total
Num: 25523587
Errors (Loudness) dB(A)
Num: 119814 Avg: 0 dB(A) Max: -5.7 dB(A)
Error Muting Samples
Num: 54509 Avg: 110.9 Samples Max: 3584 Samples
Skips Samples
Num: 2 Avg: 1596 Samples Max: 1596 Samples
Total Test Result
53.4 points (out of 100.0 maximum)

The Abex TCD-726 test disc is a usually a simple case for error correction. The BTC drive however, performed poorly. The total error count is high, while there are two skipped samples and many muted samples. The total score of 53.4 out of 100 is not acceptable.

- 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 being 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

The drive performed well. It managed to playback 5 out of attempts for three of the five levels. The fourth level sounded good for three of the five attempts and the fifth level did not play well at all. The attempt can be considered slightly better than average as most drives manage to play up to the fourth level, with some exceptions at last but fail all attempts with the fifth level, which is difficult for the majority of the drives.

- Summary

Test Disc
Reading Speed
Average Score

The final average score for the drive is quite low, and this is due to its poor showing with the ABEX TCD-726 disc where the drive scored 53.4, where most other drives manage close to 100.

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