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Home > Hardware Reviews > Optical Storage

Thursday, August 02, 2007
Lite-ON LH20A1S

3. CD Error Correction

CD Error Correction In the following tests, we check the drive's behavior when reading scratched / defective audio discs. The test discs used were the ABEX series from ALMEDIO.

- ABEX TCD-721R

Errors total
Num : 6094230
Errors (Loudness)
Num : 80215
Avg : -51.3 dB(A)
Max : -14.4 dB(A)
Error Muting
Num : 21481
Avg : 1.1 Samples
Max : 17 Samples
Skips
Num : 1960
Avg : 6.4 Samples
Max : 36 Samples
Total Test Result
55.8 points (of 100.0 maximum)

Extremely high error total count, very high Loudness levels and far too many skipped samples. It is no wonder that the drive is awarded the very low score of 55.8. This is one of the worst performances we have seen with this disc.

- ABEX TCD-726

Errors total
Num : 26524
Errors (Loudness)
Num : 503
Avg : -43.3 dB(A)
Max : -11.0 dB(A)
Error Muting
Num : 64
Avg : 1.1 Samples
Max : 2 Samples
Skips
Num : 23
Avg : 6.8 Samples
Max : 12 Samples
Total Test Result
75.7 points (of 100.0 maximum)

Better with this disc but still not a very satisfactory. Again we see skipped samples.

- CD-Check Audio Test Disc

The CD-Check Test Disc is another 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 more difficult tests. These tracks are referred to as Check Level-1 through Check Level-5.

The tracks are reproduced through a software multimedia player (e.g. Windows Media Player). Each level is considered as passed, if the tone is smooth, continuous without interruptions, skipping or looping. The higher the Check Level passed, the more reliable the sound reproduction of the tested drive.

Error Level
1
2
3
4
5
LH-20A1S
5/5
5/5
5/5
0/5
0/5

The drive managed to correctly play the first three tracks. Problems occurred with the fourth and fifth tracks. An average performance from the LH-20A1S.

The drive does not appear to be very good when it comes to CD error correction.




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