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

Monday, October 11, 2004
LiteON SOHW-1633S

3. CD Error Correction Tests

LiteON SOHW-1633S Recorder - Page 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: 5177235
Errors (Loudness) dB(A)
Num: 80405
Avg:-53.7 dB(A)
Max: -13.2 dB(A)
Error Muting Samples
Num: 26392
Avg: 1.1 Samples
Max: 12 Samples
Skips Samples
Num: 1769
Avg: 8.1 Samples
Max: 23 Samples
Total Test Result
55.4 points (out of 100.0 maximum)

The drive managed to achieve a total test result of 55.4 out of 100, which is not good. The 13.2dB(A) maximum loudness level is high but more or less usual for these drives and coupled with the extremely high error total count (over 5 million), results in a high error muting samples and skipped samples counts.

- ABEX TCD-726

Errors total
Num:
Errors (Loudness) dB(A)
Num: 0
Avg: -174.0 dB(A)
Max: -174.0 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
LiteON SOHW-1633S
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.




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