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Home > Hardware Reviews > Optical Storage > 52x CD-RW

Friday, February 20, 2004
Freecom FC-1

3. CD Error Correction Tests

Freecom FC-1 - Page 3

Error Correction Tests

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: 3425293
Errors (Loudness) dB(A)
Num: 105650
Avg:-72.2 dB(A)
Max: -5.2 dB(A)
Error Muting Samples
Num: 7405
Avg: 1.0 Samples
Max: 9 Samples
Skips Samples
Num: 0
Avg: 0 Samples
Max: 0 Samples
Total Test Result
75.2 points (out of 100.0 maximum)

As can be seen from the graph above, the drive read the contents of the defective disc returning a total of 3425293 errors, which is a little on the high side. In spite of the fact that the maximum error loudness reached was -5.2dB, in general the level was well below the "alert" limit, which means that the possibility of any audible clicks is very unlikely. There were no skipped samples and the drive recorded a score of 75.2 out of 100. In the same test, the Plextor Premium had 66.7 and the Aopen 67.

- ABEX TCD-726

Errors total
Num: 40
Errors (Loudness) dB(A)
Num:85
Avg: -75.8 dB(A)
Max:-64.7 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
91.2 points (out of 100.0 maximum)

The Abex TCD-726 test disc is much easier for drives in general to read, and as such, the Freecom drive managed a better score with this disc than it did with the 721R test disc previously. No muting or skipped samples were reported. The score was 91.2 for the Freecom which is a good score, while the Plextor and Aopen drives had 81.4 and 66.8 respectively.

- 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 abilities to read music and reproduce it completely. Five tracks on the disc contain a sequence of progressively difficult tests. These tracks are referred to 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 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 drive.

Error Level
1
2
3
4
5
Freecom FC-1
5/5
5/5
5/5
5/5
5/5

The Freecom drive managed to play flawlessly all the levels of our test disc. This behavior reveals excellent CD error correction capabilities.

- Summary

Test Disc
Reading Speed
Score
ABEX TCD-721R
Max
75.2
ABEX TCD-726
91.2
Average Score
83.2

Combining the two scores from the ABEX tests gives an average total score of 83.2 points out of 100, which is a very good score.




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