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> 2 philip playability optical test disc cd dvd sbc 444 a
2 philip playability optical test disc cd dvd sbc 444 a
Playability Test Disc CD for CD and DvD Players Test Repair
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Philips designed test discs so that CD media and drive manufacturers can coordinate their designs. These discs can also be used to support correlation between testing facilities. Philips Signal Test Disc 5259 was the original reference for Red Book digital audio. Philips Test Sample 5 was made available in 1986 to support Red Book and Orange Book tests. Test Sample 5B.2 provides the same support but from a new stamper.
Test Sample 5B.2 provides references for I11, I3, asymmetry, crosstalk, and push-pull CD-DA, CD-ROM, and CD-R tests. Orange Book reflectivity and radial contrast tests are also supported by 5B.2, plus reference values of jitter and length deviation for all legal pit and land lengths.
Philips also designed playability disc SBC 444A so that drive manufacturers can stress their pickup and servo designs. This disc contains three types of defects of various durations that disrupt radial, focus, and spindle servo circuits, thereby either creating or lengthening errors related to these defects.
Black dots having diameters of 300, 500, 600, and 800 micrometers are the second type of defect. Uncorrectable E22, E32, and BURST errors are generated by the larger dots. Proper servo and pickup designs are confirmed by a small number of errors. The third defect type is a large, simulated fingerprint that should not generate uncorrectable errors.
Philips disc SBC 444A can be used as an error reference disc. Error rates in the interruption, black dot, and fingerprint regions can be used to confirm the stability of a test drive. E22, E32, and BURST error rates for the black dots can be calculated and compared to measured results. Results from high quality test drives will slightly exceed calculated values because of practical servo and pickup limitations. Poor quality drives will generate much higher error rates.
Philips 5B.2 and SBC 444A provide a proven and accepted basis for correlation. These discs should be available through your test equipment provider. Single point calibration only provides correlation for values near that point. Studies have shown poor correlation when parameters depart significantly from the 5B.2 values. Unfortunately, this lack of correlation can exist at specification limits. Measurements at one facility might pass the disc while tests at a different location could fail the same disc. Although an obvious solution is to make discs that are well within the specification limits, efforts have been made to generate linearity test discs that would support multiple-point correlation.
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