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Home > Hardware Reviews > Optical Storage > DVD-ROM

Thursday, August 05, 2004
LiteON SOHD-167T

3. CD Error Correction Tests

LiteOn SOHD-167T - 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

LiteOn SOHD167T
Errors total
Num: 16324527
Errors (Loudness) dB(A)
Num: 120120
Avg: -45.0 dB(A)
Max: -7.2 dB(A)
Error Muting Samples
Num: 34042
Avg: 1.5 Samples
Max: 3401 Samples
Skips Samples
Num: 0
Avg: 0.0 Samples
Max: 0 Samples
Total Test Result
73.6 points (out of 100.0 maximum)
C2 Accuracy
52.9 % (out of 100.0% maximum)

The 167T drive performed satisfactorily with the ABEX TCD-721R test disc. The drive had a high Loudness Error level at -7.2 dB(A) and the total error count was also on the high side but there were no skipped samples. The total score of 73.6 points however is good. The only downside was the C2 accuracy score which reached only 52.9%, a very poor performance there.

Below are the test results for the other two LiteON drives:

Score

- ABEX TCD-726

LiteOn SOHD167T
Errors total
Num: 71
Errors (Loudness) dB(A)
Num: 11
Avg: -77.0 dB(A)
Max: -66.5 dB(A)
Error Muting Samples
Num: 0
Avg: 0.0 Samples
Max: 0 Samples
Skips Samples
Num:0
Avg: 0.0 Samples
Max: 0 Samples
Total Test Result
93.3 points (out of 100.0 maximum)
C2 Accuracy
100 % (out of 100.0% maximum)

With the ABEX TCD-726 test disc, the drive received 93.3 points for the total test result score and 100 % for C2 accurancy. The LiteOn drive managed a high error correction with the ABEX TCD-726 test media which is an easy test disc for the majority of drives.

- 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 abilities 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 files 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 SOHD167T
5/5
5/5
5/5
5/5
5/5

The drive passed all the Check Levels of the Check Disc test. The performance was excellent offering good sound reproduction and error correction. The fifth level includes an error size of 1.500mm. Very few drives manage to play all tracks perfectly.

- Conclusion

LiteON SOHW-167T offers a good CD error correction. The drive will not perform well with highly scratched media, such as the Abex TCD-721R since it logged many errors and hence had a reduced C2% accuracy score...




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