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

Wednesday, June 08, 2005
Sony DRU-800A

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: 1176122
Errors (Loudness) dB(A) Num: 53465 Avg:-73.2 dB(A) Max: -34.9 dB(A)
Error Muting Samples Num: 3774 Avg: 1.0 Samples Max: 11 Samples
Skips Samples Num: 0 Avg: 6.0 Samples Max: 6 Samples
Total Test Result 76.5 points (of 100.0 maximum)
C2 Accuracy 99.8%

The overall performance according to the graph is rather good. The total error count is not high, which is good, and the maximum error loudness just on the -35 dB(A) limit. Also, no samples were skipped and the total test result of 76.5 out of 100 is good.

- ABEX TCD-726

Errors total Num: 0
Errors (Loudness) dB(A) Num:0 Avg: 0 Samples Max: 0 Samples
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
Sony DRU-800A 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 performance with the specific test disc. The fourth and the fifth levels include an error size of 1.125mm and 1.500mm respectively, and the drive produced continuous audible clicks over those tracks.




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