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Home > Hardware Reviews > Optical Storage > DVD External

Wednesday, May 17, 2006
LG GSA-2166D

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: 854948
Errors (Loudness) dB(A) Num: 51160 Avg: -74.7 dB(A) Max: -31.6 dB(A)
Error Muting Samples Num: 2782 Avg: 1.1 Samples Max: 89 Samples
Skips Samples Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result 76.8 points (of 100.0 maximum)

Quite good performance. A low total error count and low maximum error loudness level, as well as no skipped samples indicate good performance which is confirmed in the result score of 76.8.

- ABEX TCD-726

Errors total Num: 23
Errors (Loudness) dB(A) Num: 90 Avg: -89.0 dB(A) Max: -76.1 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 91.0 points (of 100.0 maximum)

Unfortunately, the drive could not achieve flawless reading with the 726 test media. A little unexpected considering its performance with the TCD-721R disc previously. Nevertheless, 91.0 points is still good.

- 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
LG GSA-2166D 5/5 5/5 5/5 0/5 0/5

Average performance with this disc, where the drive managed to read the third track without error. In the fourth and fifth tracks, the drive produced audible clicks and so could not fully correct the errors present.

Overall, average to good CD Error Correction mechanism.




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