Error Correction Tests

In the following tests we examine the reading error correction capabilities of AOpen EHW-4048U.

- EAC CD-R Test Disc

- Test Results (Max Reading)

Errors total	Num: 26320
Errors (Loudness) dB(A)	Num: 8649	Avg:-83.6 dB(A)	Max: -13.0 dB(A)
Error Muting Samples	Num: 122	Avg:1.7 Samples	Max: 5 Samples
Skips Samples	Num: 0	Avg: 0 Samples	Max:0 Samples
Total Test Result	81.2 points (of 100.0 maximum)

Despite the fact that the drive did not corrected 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 -83.6dB(A). The drive also didn't skip any samples resulting to an overall score of 81.2 out of 100 (perfect), which is quite good.

- ABEX TCD-721R

- Test Results (Max speed)

Errors total	Num: 75364191
Errors (Loudness) dB(A)	Num: 391474	Avg:-28.5 dB(A)	Max: -1.6 dB(A)
Error Muting Samples	Num: 199092	Avg: 19.8 Samples	Max: 3584 Samples
Skips Samples	Num: 2	Avg: 2939.0 Samples	Max: 2939 Samples
Total Test Result	51.2 points (of 100.0 maximum)

The ABEX 721R test disc is very hard to read for almost all the drives. The AOpen EHW-4048U showed a bad behavior since it started reporting errors before the artificially defected area begin. The error spikes reached -1.6 dB(a) in several areas and many skipped samples occurred. The performance is low (51.2 points).

- ABEX TCD-726

- Test Results (Max Speed)

Errors total	Num: 140018342
Errors (Loudness) dB(A)	Num: 654784	Avg:-23.7 dB(A)	Max: -5.5 dB(A)
Error Muting Samples	Num: 288703	Avg: 4.0 Samples	Max: 3584
Skips Samples	Num: 1	Avg: 409 Samples	Max: 409 Samples
Total Test Result	57.4 points (of 100.0 maximum)

The AOpen drive didn't perform well, giving many errors especially by the end of the process and got a 57.4 score.

- Conclusion

Test Disc	Reading Speed	AOpen EHW-4048U
EAC CD-R	Max	81.2
ABEX TCD-721R	Max	51.2
ABEX TCD-726	Max	57.4
Average Score		63.26

The AOpen EHW-4048U got a less than medium overall score of 63.26.

- C2 Information accuracy

- Test Results (MAX Speed)

The C2 accuracy of the AOpen EHW-4048U is very low according to the CDSpeed. The drive got an 38.31% score. The quality is also very low due to high number of sync errors. The EAC analyzer 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	51.6
ABEX TCD-726	Max	50.0
Average Score		67.0