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Home > Hardware Reviews > Optical Storage

Friday, December 19, 2008
Samsung SH-S223F

3. Defected CD reading tests

This series of tests checks the drive's ability to correct/conceal possible erroneous data after reading artificially scratched / defective audio discs. The test discs used were the ABEX series from ALMEDIO.

Specifically, a software compares two audio files using FFT analysis. The first audio file has been extracted by a normal audio disc. The second one is the result of the extraction of the another disc which hold the same audio track, but it also has specific defects on its surface. The similarity factor of the the two tracks unveils the error correction capabilities of the drive.

The differences between the two compared tracks are translated to a signal (noise) illustrated in the following graphs.

- ABEX TCD-721R

Errors total Num : 884201
Errors (Loudness) 47445 Avg: -73.5 dB(A) Max :-10.2 dB(A)
Error Muting Num : 2858 Avg : 1.0 Samples Max : 7 Samples
Skips Num : 0 Avg : 0.0 Samples Max : 0 Samples
Total Test Result 76.9 points (of 100.0 maximum)
C2 Accuracy 96.9 %

A relatively good score for the Samsung drive. There were no skipped samples and the error correction did not start earlier than it should, but the Error Loudness sometimes surpassed the -60 dB(A) border. Noise above that value can sometimes become audible, depending on the music that surrounds it. Thus, we can say that the drive's error hiding feature is mediocre.

- ABEX TCD-726

Errors total Num : 0
Errors (Loudness) Num : 0 Avg : -174.0 dB(A) Max : -174.0 dB(A)
Error Muting Num : 0 Avg : 0.0 Samples Max : 0 Samples
Skips Num : 0 Avg : 0.0 Samples Max : 0 Samples
Total Test Result 80.5 points (of 100.0 maximum)
C2 Accuracy 100.0 %

Pretty good performance here for the error correction mechanisms.

- 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
TSST SH-S223F 5/5 5/5 5/5 0/5 0/5

Playback of the last two tracks (4 and 5) produced audible noise and interruptions. This is a common score among DVD-RW drives and shows acceptable error correction mechanisms. However, there were some drives in the past that had managed to reproduce the all the tracks of this test.

- Summary

A decent behavior here with the drive to easily read the disc with fingerprints and dots on it, whie it was less efficient in reading the scratched one. The performance is above the average so it could get a score of 7 out of 10 here.




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