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

Wednesday, November 23, 2005
LiteOn SHW-1635S

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: 776367
Errors (Loudness) dB(A)
Num: 46459
Avg: -73.9 dB(A)
Max: -20.6 dB(A)
Error Muting Samples
Num: 2487
Avg: 1.0 Samples
Max: 8 Samples
Skips Samples
Num: 0
Avg: 0.0 Samples
Max: 0 Samples
Total Test Result
77.1 points (of 100.0 maximum)
C2 Accuracy
99.6 %

With a low total error count and no skipped samples, the drive's error correction mechanism seems to be very good in this CD error correction test.

- ABEX TCD-726

Errors total
Num: 66
Errors (Loudness) dB(A)
Num: 11
Avg: -77.5 dB(A)
Max: -69.4 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
93.3 points (of 100.0 maximum)
C2 Accuracy
100 %

Surprisingly enough, the drive did not manage to achieve a flawless 100 points result, as is the case with many of the best drives with this test disc. Nevertheless, the result is satisfactory.

- 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 (e.g. 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 SHW-1635S
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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