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Home > Hardware Reviews > Optical Storage > DVD External

Thursday, April 27, 2006
LiteOn SLW 831SX

3. CD Error Correction

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: 1080541
Errors (Loudness) dB(A) Num: 54080 Avg: -73.7 dB(A) Max: -23.1 dB(A)
Error Muting Samples Num: 3438 Avg: 1.0 Samples Max: 8 Samples
Skips Samples Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result 76.6 points (of 100.0 maximum)
C2 Accuracy 99.7 %

Good performance was reported while testing the drive with the 721 test media. The total error count is average while most importantly, no samples were skipped. Although the maximum error loudness is at -23.1 dB(A), if we take a look at the graph above, we will see that this was a single case while for the rest, the level remained below -36.0 dB(A).

- ABEX TCD-726

Errors total Num: 0
Errors (Loudness) dB(A) Num: 0 Avg: - dB(A) Max: - 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 points (of 100.0 maximum)
C2 Accuracy 100 %

Flawless reading with the 726 test media. 100 points in total test result and 100% C2 accuracy.

- 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 SLW 831SX 5/5 5/5 5/5 0/5 0/5

Average performance in this case, with the CD-Check Audio Test Disc. The drive managed to read up to the 3rd error level. In the 4th level, audible clicks were present and the drive could not reproduce the track correctly.

Overall, good CD error correction capabilities.




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