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

Wednesday, May 04, 2005
LiteON SOHW-1673S

3. CD Error Correction Tests

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: 918141
Errors (Loudness) dB(A)
Num: 51282
Avg:-74.1 dB(A)
Max: -34.7 dB(A)
Error Muting Samples
Num: 2924
Avg: 1.0 Samples
Max: 11 Samples
Skips Samples
Num: 2
Avg: 6.0 Samples
Max: 6 Samples
Total Test Result
71.9 points (of 100.0 maximum)
C2 Accuracy
99.6%

The performance according to the graph is good. From the results we see that the total error count is low, which is good and the maximum error loudness at just under -35 dB(A) is also good. Unfortunately, there were some skipped samples which prevented the drive from attaining a higher total test result score. Good performance otherwise.

- ABEX TCD-726

Errors total
Num: 0
Errors (Loudness) dB(A)
Num:0
Avg: 0 Samples
Max: 0 Samples
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
LiteON SOHW-1673S
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 performance with the specific test disc. 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.




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