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Lite-ON LH20A1S

Aug 2,2007 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. Verbatim - CDR
7. Mitsubishi Kagaku - CDRW
8. DaTARIUS DVD Analyzer R 2x
9. TYG03
10. MCC 03RG20
11. TTH02
12. TTG02
13. ProdiscS05
14. ProdiscF01
15. OPTODISC R016
16. Infodisc-R20
17. CMC MAG AE1
18. YUDEN000 T03
19. MCC 004 (000)
20. RITEK R04
21. RICOHJPN R03 (004)
22. PRODISC R04 004
23. OPTODISC R16 000
24. OPTODISC OR8
25. DAXON AZ3 (000)
26. CMC MAG M01 000 (00)
27. RICOHJPN D00 001
28. MKM 003 000
29. MKM 03RD30
30. MKM A03 000
31. MKM 01RW6X01
32. Media List
33. Conclusion

 

Memorex CD-R

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 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

Memorex 48x

Manufacturer
CMC Magnetics
Capacity

79:59:71

703 MB

- Writing strategy

Average Writing Speed: 37.33x
Writing time: 02:38:min

- Reading speed

- Writing Quality - Clover Systems

Good writing and a PASSED rating from the otherwise austere Clover Systems tests..

- 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. Verbatim - CDR
7. Mitsubishi Kagaku - CDRW
8. DaTARIUS DVD Analyzer R 2x
9. TYG03
10. MCC 03RG20
11. TTH02
12. TTG02
13. ProdiscS05
14. ProdiscF01
15. OPTODISC R016
16. Infodisc-R20
17. CMC MAG AE1
18. YUDEN000 T03
19. MCC 004 (000)
20. RITEK R04
21. RICOHJPN R03 (004)
22. PRODISC R04 004
23. OPTODISC R16 000
24. OPTODISC OR8
25. DAXON AZ3 (000)
26. CMC MAG M01 000 (00)
27. RICOHJPN D00 001
28. MKM 003 000
29. MKM 03RD30
30. MKM A03 000
31. MKM 01RW6X01
32. Media List
33. Conclusion

 

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