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LITE-ON DVDRW-LH20A1L

Dec 26,2007 0

5. Ritek CDR

 

Review Pages

1. Introduction
2. CD - DVD Reading
3. CD Error Correction
4. DVD Error Correction
5. Ritek CDR
6. MoserBaer CDR
7. Verbatim CDR
8. Verbatim CDRW
9. DaTARIUS DVD Analyzer R 2x
10. CMC MAG AM3
11. DAXON 008S
12. MCC 03RG20
13. OPTODISC R016
14. TTH02
15. TYG03
16. MKM 03RD30
17. MKM 01RW6X01
18. CMC MAG E01
19. CMC MAG M01
20. DAXON AZ3
21. MCC 004
22. PRODISC R05
23. YUDEN000 T03
24. MKM 003
25. MKM A03
26. M01J5006
27. MXL22
28. Media List - Booktype - DVD Overburning
29. Conclusion

 

For this test, each 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.

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 (37.05X Average)
Writing time - 2:40 min

Reading strategy - 48X (36.88X Average)


Writing Quality - Clover Systems

Nero CD Speed produced smooth graphs in both the writing and reading sessions with this Ritek CDR, but the Clover Systems test discovered an over the limited E32 count and FAILED the disc.

- 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. Ritek CDR
6. MoserBaer CDR
7. Verbatim CDR
8. Verbatim CDRW
9. DaTARIUS DVD Analyzer R 2x
10. CMC MAG AM3
11. DAXON 008S
12. MCC 03RG20
13. OPTODISC R016
14. TTH02
15. TYG03
16. MKM 03RD30
17. MKM 01RW6X01
18. CMC MAG E01
19. CMC MAG M01
20. DAXON AZ3
21. MCC 004
22. PRODISC R05
23. YUDEN000 T03
24. MKM 003
25. MKM A03
26. M01J5006
27. MXL22
28. Media List - Booktype - DVD Overburning
29. Conclusion

 

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