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Home > Hardware Reviews > Optical Storage > 48x CD-RW

Tuesday, November 19, 2002
AOpen CRW4850 CD-RW

3. CD Error Correction

AOpen CRW4850 IDE CD-RW - Page 3

Error Correction Tests

In the following tests we examine the reading error correction capabilities of AOpen CRW4850.

- EAC CD-R Test Disc

- Test Results (Max Reading)

Errors total
Num: 29808
Errors (Loudness) dB(A)
Num: 11505
Avg:-86.2 dB(A)
Max: -30.5 dB(A)
Error Muting Samples
Num: 53
Avg:1.9 Samples
Max: 6 Samples
Skips Samples
Num: 0
Avg: 0 Samples
Max:0 Samples
Total Test Result
81.6 points (of 100.0 maximum)

Despite the fact that the drive did not completely correct the data from neither the black triangle defect nor the five scratched areas, the amount of total errors is not very high and the average error level is only -86.2dB(A). The drive also didn't skip any samples resulting to an overall score of 81.6 out of 100 (perfect), which is quite good.

- ABEX TCD-721R

- Test Results (Max speed)

The ABEX 721R test disc is very hard to read for almost all the drives. The AOpen CRW4850 showed not a good behaviour since it reported errors before the artificially defected area begin. The error spikes reached -14.2 dB(a) in several areas, but no skipped samples occurred. The performance is average (75.3 points).

Errors total
Num: 1028225
Errors (Loudness) dB(A)
Num: 62108
Avg:-74.9 dB(A)
Max: -14.2 dB(A)
Error Muting Samples
Num: 5923
Avg: 2.0 Samples
Max: 84 Samples
Skips Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Total Test Result
75.3 points (of 100.0 maximum)

- ABEX TCD-726

- Test Results (Max Speed)

The AOpen drive performed quite well, giving a few errors and got an 83.8 score.

Errors total
Num: 7609
Errors (Loudness) dB(A)
Num: 2556
Avg:-89.8 dB(A)
Max: -47.7 dB(A)
Error Muting Samples
Num: 37
Avg: 1.3 Samples
Max: 4
Skips Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Total Test Result
83.8 points (of 100.0 maximum)

- Conclusion

Test Disc
Reading Speed
AOpen CRW4850
Score
EAC CD-R
Max
81.6
ABEX TCD-721R
Max
75.3
ABEX TCD-726
Max
83.8
Average Score
80.23

The AOpen CRW4850 got an overall score of 80.23.

- C2 Information accuracy

- Test Results (MAX Speed)

The C2 accuracy of the AOpen CRW4850 was not good since the drive got an 85.20% score. On the other hand, the quality score was high (88.6 out of 100).

The EAC analyser software reported the following C2 %. The different results in C2% accuracy between the CDSpeed and EAC are due to different calculation method, but both tests indicate that the drive cannot be used safely for DAE when using C2 error information.

Test Disc
Reading Speed
AOpen CRW5224
Score
EAC CD-R
Max
66.9
ABEX TCD-721R
Max
67.0
ABEX TCD-726
Max
67.0
Average Score
67.0




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