3. Reading of defected CDs
2. CD/DVD reading tests
3. Reading of defected CDs
4. Reading of defected DVDs
5. About the IQB Omni CD DVD Analyzer by Quantized
6. CD-R burning - CMC Magnetics CD-R 48x @ 48x
7. CD-R burning - Taiyo Yuden CD-R 48x @ 48x
8. CD-R burning - Memorex (Ritek) CD-R 48x @ 16x
9. CD-RW burning - Verbatim CD-RW 24x @ 24x, verbatim 32x CD-RW @ 32x
10. DVD-R burning - Philips DVD-R (CMCMAG AM3) 16x @ 16x
11. DVD-R burning - Moser Baer India DVD-R (MBI 01RG40) 16x @ 16x
12. DVD-R burning - Verbatim DVD-R (MCC 03RG20) 16x @ 16x
13. DVD-R burning - Ridisc DVD-R (TTH02) 16x @ 16x
14. DVD-R burning - Taiyo Yuden DVD-R (TYG03) 16x @ 24x
15. DVD+R burning - Philips DVD+R (INFOME R30) 16x @ 16x
16. DVD+R burning - Prodisc DVD+R (PRODISC R05) 16x @ 16x
17. DVD+R burning - Moser Baer India DVD+R (MBIPG101 R05) 16x @ 16x
18. DVD+R burning - Verbatim DVD+R (MCC 004) 16x @ 16x
19. DVD+R burning - Taiyo Yuden DVD+R (YUDEN000 T03) 16x @ 24x
20. DVD+R DL burning - Verbatim DVD+R DL (MKM 003) 8x @ 8x
21. DVD+R DL burning - Ritek DVD+R DL (Ritek S06) 16x
22. DVD-R DL burning - Verbatim DVD-R DL (MKM 03RD30) 8x @ 8x
23. DVD-R DL burning - Verbatim DVD-R DL (MKM 04RD30) 12x @ 12x
24. DVD+RW burning - Verbatim DVD+RW (MKM A03) 8x @ 8x
25. DVD-RW burning - Verbatim DVD-RW (MKM 01RW6X01) 6x @ 6x
26. DVD-RAM burning - Maxell DVD-RAM 5x (MXL16) 5x @ 5x, Maxell DVD-RAM 12x (MXL22) 12x @ 12x
27. Summary of CD/DVD writing quality tests, Booktype, overburning
28. SmartErase, LabelTag
29. Final words
This series of tests checks the drive's ability to correct/conceal possible erroneous data after reading artificially scratched / defective audio discs.
Using a CD-R in best shape to do the DAE test is generally not a safe way to test the drive's error correction capabilities. If your drive would not read audio CDs error free from an error free disc, you would probably bring the drive back to the vendor. It is far more interesting to see how a drive is behaving under critical conditions (which will also tell something about the DAE quality on CDs that have manipulated C2 error information on purpose). For that a special test CD like the ABEX discs from ALMEDIO can be used, that can be used to do a comparison between different drives. The ABEX test disc is actually an AudioCD that has artificial scratches and other physical disc error patterns on its surface.
Using a special software, we compare two audio files using FFT analysis. The first audio file has been extracted by a normal audio disc without physical error patterns on it . The second one is the result of the extraction of the ABEX test discs which hold the same audio tracks, 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. Each graph tells a lot about the abilities of the drive. The quality of the optical system (and/or of the error correction capabilities of the firmware) is shown in at which time index the error start. The error hiding qualities are shown when the wedge gets bigger. The X position of a grid line is always a start of a new minute position on the CD (in play time, up to 74 min). The Y axis shows the dB(A) value of the error in the extracted file. The 0 dB(A) baseline at the top is marked slightly different. So the graph shows a range of 6 dB(A) down to -120.0 dB(A). Each line represents 6 dB(A) of volume (6 dB(A) louder means that the sound is double as loud).
- ABEX TCD-721R
|Errors total||Num : 941686|
|Errors (Loudness)||Num : 48260||Avg : -73.6 dB(A)||Max : -23.1 dB(A)|
|Error Muting||Num : 3092||Avg : 1.0 Samples||Max : 9 Samples|
|Skips||Num : 0||Avg :0.0 Samples||Max 0 Samples
|Total Test Result LiteOn iHAS524||76.8 points (out of 100.0 maximum )|
|Total Test Result LiteOn iHAS324||76.8 points (out of 100.0 maximum )|
|Total Test Result Optiarc AD-7240S||76.9 points (out of 100.0 maximum)|
The drive's performance on this disc can be commented using the graph above. Error correction is good here, starting at the point where the defect is starting to grow, but error hiding mechanisms are average. We can tell that by the noise exceeds that -60 db(A) level, especially after the 32min mark where the scratch on the surface of the disc becomes bigger.
- ABEX TCD-726R
|Errors total||Num : 0|
|Errors (Loudness)||Num : 0||Avg : -174.0 dB(A)||Max : -174.0 dB(A)|
|Error Muting||Num : 0||Avg : 0 Samples||Max :0 Samples|
|Skips||Num :0||Avg :0,0 Samples||Max 0 Samples
Total Test ResultLiteOn iHAS524
|100 points (out of 100.0 maximum)|
|Total Test Result LiteOn iHAS324||100 points (out of 100.0 maximum)|
|Total Test Result Optiarc AD-7240S||100 points (out of 100.0 maximum)|
Very good error correction mechanisms, providing a very good performance. No skips were performed, as well as no mutings.
- 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.
An average good performance for the LiteOn iHAS524, as it successfully played only the first 3 tracks.