In the following tests, we check the drive's behavior when it comes to reading scratched / defective discs. The test discs we use are the ABEX series from ALMEDIO.

- ABEX TCD-721R

Errors total	Num: 897874
Errors (Loudness) dB(A)	Num: 41421	Avg: --73.8 dB(A)	Max: -19.1 dB(A)
Error Muting Samples	Num: 2236	Avg: 1.1 Samples	Max: 78 Samples
Skips Samples	Num: 0	Avg: 0 Samples	Max: 0 Samples
Total Test Result	77.2 points (out of 100.0 maximum)
C2 Accuracy	97.4 %

The total error count was low, and although the maximum error loudness is high, from the graph we can see that performance is generally good. The error and muted samples are quite low while no samples were skipped. The 77.2 points out of 100 is a good score with this test disc.

- ABEX TCD-726

Errors total	Num: 678507
Errors (Loudness) dB(A)	Num: 0	Avg: -174 dB(A)	Max: -174 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)

The behavior of drive was much better in this case where it managed to correct all the disc's errors. The result was a perfect 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 ability to read music and reproduce it completely. Five tracks on the disc contain a sequence of progressively difficult tests. These tracks are referred as Check Level -1 through Check Level -5.

The tracks are reproduced (played) through a software multimedia player (i.e. Windows Media Player). Each level is considered as passed, if the tone coming out from the speakers is smooth, continuous without interruptions, skipping or looping. The higher the Check Level passed, the more reliable the sound reproduction of the tested device.

Error Level	1	2	3	4	5
AOpen DUW1608/ARR	5/5	5/5	5/5	0/5	0/5

The drive passed only the first three Check Levels of the test. The performance reveals average sound reproduction and error correction. The fourth and the fifth levels include an error size of 1.125mm and 1.500mm respectively and the drive produced continues audible clicks over those tracks.