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Home > Hardware Reviews > Optical Storage > Combo

Tuesday, November 25, 2003
Teac DW-548D

3. CD Error Correction Tests

TEAC DW-548D COMBO DRIVE - Page 3

Error Correction Tests

In the following tests we check the drive's behavior when reading scratched / defective audio discs. Fot this test we use discs from the ABEX series from ALMEDIO.

- ABEX TCD-721R

Errors total
Num: 175814921
Errors (Loudness) dB(A)
Num: 831762
Avg: -26.9 dB(A)
Max: -5.6 dB(A)
Error Muting Samples
Num: 369963
Avg: 1.2 Samples
Max: 3578 Samples
Skips Samples
Num: 68
Avg: 729.1 Samples
Max: 2939 Samples
Total Test Result
48.4 points (out of 100.0 maximum)

The performance here isn`t best, but has the average value. The total error count is extremely high, as are the average and maximum loudness error level at -26.9 dB and -5.6 dB respectively. The skipped samples are also high and the final score of 48.4 is a good indication of just how badly the drive performed. Please note that the drive was very slow in the ripping process of the test disc. TEAC DW-548D slows down the reading speed when the condition of the disc begun to be bad. Although this strategy could be legitimate in some cases offering accurate results, it turns out to be ineffective with heavily scratched discs.

- ABEX TCD-726

Errors total
Num: 0
Errors (Loudness) dB(A)
Num: 0
Avg: -174.0 dB(A)
Max: -174.0 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
100.0 points (out of 100.0 maximum)

The Abex TCD-726 test disc is much easier for drives in general to read. TEAC DW-548D gets 100% with no error (loudness), muting and skips to the samples. The drive is able to accurately read scratched media, as far as the the size of the scratch is lower than 1.500mm approximately.

- 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 more 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 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 drive.

Error Level
1
2
3
4
5
TEAC DW-548D
5/5
5/5
5/5
5/5
0/5

The drive successfully passed four of the five check levels for this test. Notice that the 5th check level has a scratch a size of 1.500 mm, and it is difficult to be read by most of the drives. Hence, we can say that the drive is good for correcting this type of defective disc.

- Summary

Test Disc
Reading Speed
Score
ABEX TCD-721R
Max
48.4
ABEX TCD-726
100
Average Score
74.2

So, summarizing we can say that the drive is good at correcting badly scratched discs, coming with the average score at 74,2.




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