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

Wednesday, February 15, 2006
Memorex 16X-DDL-IN

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: 1764232
Errors (Loudness) dB(A) Num: 122294 Avg: -77.7 dB(A) Max: -35.8 dB(A)
Error Muting Samples Num: 5510 Avg: 1.0 Samples Max: 40 Samples
Skips Samples Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result 75.3 points (out of 100.0 maximum)
C2 Accuracy 99.8 %

The drive showed average to good performance although it could be better. The total error count is high and is spread over the whole disc. But the maximum error loudness is within acceptable limits and most important, there were no skipped samples.

- ABEX TCD-726

Errors total Num: 3960
Errors (Loudness) dB(A) Num: 5860 Avg: -83.8 dB(A) Max: -53.8 dB(A)
Error Muting Samples Num: 76 Avg: 1.0 Samples Max: 1 Samples
Skips Samples Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result 82.6 points (out of 100.0 maximum)
C2 Accuracy 100.0 %

The 726 test media, is not a problems for the majority of the latest drives. But in the case of Memorex, the performance was less than average. Since the Memorex is a NEC ND-4550A, it had similar performance to NEC drives...

- 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
Memorex 16X
5/5 5/5 5/5 2/5 0/5

The drive successfully passed 3 out of the five check levels for this test. Almost all drives have difficulties reading the 5th level but good quality drives can read the whole of the 4th level but unfortunately, the drive managed to read only 2 out 5 from the 4th level.

- Summary

Overall, the drive has good CD error correction.




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