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LG HL-DT-ST GSA-H62N

Jul 1,2007 0

5. CMC Magnetics CDR

 

Review Pages

1. Introduction
2. CD - DVD Reading
3. CD Error Correction
4. DVD Error Correction
5. CMC Magnetics CDR
6. MoserBaer CDR
7. Ritek CDR
8. Verbatim CDR
9. CMC Magnetics CDRW
10. Verbatim CDRW
11. DaTARIUS DVD Analyzer R 2x
12. CMC MAG AE1
13. DAXON008S
14. CMC MAG AM3
15. ProdiscF02
16. TTH02
17. MCC 03RG20
18. TYG03
19. MKM 01RW6X01
20. MKM 03 RD30
21. CMC MAG E01
22. RITEK R03 002
23. OPTODISC R16
24. CMC MAG M01
25. RICOHJPN R03
26. MCC 004 000
27. YUDEN000 T03
28. MKM A03
29. MKM 003 000
30. Media List
31. Conclusion

 

For this test, each CD-R disc is burned to its maximum capacity and at its maximum speed. Then, the same disc is read with the CDSpeed software, and the disc is 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.

Disc Info

CDspeed provides information about the inserted media as well as the maximum supported burning speed. For more details, you can click on the images.

Writing strategy - 48X (36.71X Average)
Writing time - 2:42 min

Reading strategy - 48X CAV (37.03X Average)


Writing Quality - Clover Systems

This isn't bad, despite the FAILED rating from the Clover Systems tests. These test are very strict making it difficult for most discs to get a PASS rating. What is important here is that the E32 counts are all zero.

- 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.

 

Review Pages

1. Introduction
2. CD - DVD Reading
3. CD Error Correction
4. DVD Error Correction
5. CMC Magnetics CDR
6. MoserBaer CDR
7. Ritek CDR
8. Verbatim CDR
9. CMC Magnetics CDRW
10. Verbatim CDRW
11. DaTARIUS DVD Analyzer R 2x
12. CMC MAG AE1
13. DAXON008S
14. CMC MAG AM3
15. ProdiscF02
16. TTH02
17. MCC 03RG20
18. TYG03
19. MKM 01RW6X01
20. MKM 03 RD30
21. CMC MAG E01
22. RITEK R03 002
23. OPTODISC R16
24. CMC MAG M01
25. RICOHJPN R03
26. MCC 004 000
27. YUDEN000 T03
28. MKM A03
29. MKM 003 000
30. Media List
31. Conclusion

 

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