5. CD-R burning - Ritek 48x
2. CD/DVD reading tests
3. CD error correction tests
4. DVD error correction tests
5. CD-R burning - Ritek 48x
6. CD-R burning - CMC MAG 48x
7. CD-RW burning - Verbatim 32x
8. About the DaTARIUS 2x Analyzer
9. DVD-R burning - CMCMAG AM3 16x
10. DVD-R burning - MCC 03RG20 18x
11. DVD-R burning - PRODISCS05 16x
12. DVD-R burning - RITEKF1 16x
13. DVD-R burning - TTH02 18x
14. DVD-R burning - TYG03 20x
15. DVD+R burning - DAXON AZ3 16x
16. DVD+R burning - MAXELL 003 16x
17. DVD+R burning - MCC 004 16x
18. DVD+R burning - RPODISC R05 16x
19. DVD+R burning - RICOHJPN R03 004 16x
20. DVD+R burning - RPODISC R04 16x
21. DVD+R burning - YUDEN000 T03 18x
22. DVD-RW burning - MKM 01RW6X01 6x
23. DVD+RW burning - MKM A03 8x
24. DVD-R DL burning - MKM 03RD30 8x
25. DVD+R DL burning - MKM 003 8x
26. DVD-RAM burning - MXL22 12x
27. Summary of DVD recording tests
28. EZ-DUB page 1
29. EZ-DUB page 2
30. Final words
For this test (and for all ensuing tests with CD-R media), the CD-R disc was burned to its maximum capacity and at its maximum speed. Then, the same disc is read with the CDSpeed software, and the disc was scanned for digital errors (BLER, C1 and C2) with our system provided by Clover Systems. To simplify the presentation, we present the BLER, E31 and E32 error rates for each disc, which unveil the most serious errors on each disc.
- Writing strategy
16x (16.04x Average Speed/ Elapsed time 5:30)
Although we had chosen the 48X speed for this test, the drive burned the disc at 16X CLV.
- Reading speed
48,17x( 36,20x Average Speed )
- Writing Quality - Clover Systems
No uncorrectable errors were reported; nice burning quality.
- About Clover Systems
The Clover Systems CDX Compact Disc Analyzer is a tool to quantitatively measure the quality of a CD. It will analyze CD-DA, CD-ROM, CD-ROM XA, CD-I, CD-R, Photo-CD, Enhanced CD and CD-RW discs at 4X, 8X, 24X, 32X or 40X speed. It effectively measures disc quality by examining the quantity and severity of CIRC errors generated during playback. It also provides the capability to measure signal parameters related to pit geometry, such as asymmetry and reflectivity. Together, all these bits of information provide a thorough analysis of disc quality. The Clover Systems Analyzers can also perform various format-checking tests on data discs, and do bit-for-bit data comparison on all types of CDs. All tests are carried out at the speed of 4X.
CIRC error correction uses two principles to detect and correct errors. The first is redundancy (extra information is added, which gives an extra chance to read the disc), and the second is interleaving (data is distributed over a relatively large physical area). The CIRC error correction used in CD players uses two stages of error correction, the well known C1 and C2, with de-interleaving of the data between the stages.
The error type E11 means one bad symbol was corrected in the C1 stage. E21means two bad symbols were corrected in the C1 stage. E31 means that there were three or more bad symbols at the C1 stage. This block is uncorrectable at the C1 stage, and is passed to the C2 stage. Respectively, E12 means one bad symbol was corrected in the C2 stage and E22 means two bad symbols were corrected in the C2 stage. E32 means that there were three or more bad symbols in one block at the C2 stage, and therefore this error is not correctable.
BLER (Block Error Rate) is defined as the number of data blocks per second that contain detectable errors, at the input of the C1 decoder. Since this is the most general measurement of the quality of a disc, you will find BLER graphs for all media tested below. If you click on the images you can see a more detailed table, indicating error levels. The Red Book specification (IEC 908) calls for a maximum BLER of 220 per second averaged over ten seconds. Discs with higher BLER are likely to produce uncorrectable errors. Al low BLER shows that the system as a whole is performing well, and the pit geometry is good. However, BLER only tells us how many errors were generated per second, and it does not tell us anything about the severity of those errors.