optical technology, media ordering information, cd mastering, dvd mastering, blu-ray mastering, single layer optical media, bd rom optical media, bd-r dl optical media Search      About OM&T Products Test Discs About Test Disc Test Disc Products - Products Overview - Products Catalogue - Terms & Conditions Philips Blu-ray Test Disc Range Special CD/ DVD Ranges Media Ordering News Center Job Opportunities Contact      Home  -  Products  -  Test Discs  -  Test Discs Products  -  Products Overview     Products Overview Back Semi - Physical Defects Semi-physical defects are defects which are applied to the test discs manually, for example to simulate damage or soiling of discs as experienced under actual operating conditions.      Wedge A wedge is an interruption of data readout, and is used to check the error-correction performance of the player or drive. Interruptions maybe short or long. As long as they are within the error correction code there should be no uncorrectable error, for example resulting in audible interruption of play.     Black dot Black dots, for example caused by fly droppings or other forms of soiling, contribute to reduced reflection of the optical path and in some cases, depending on size, to drop-outs in the HF signal. The black dot disc is used to test the error correction, front-end circuit. Severe beam landing at the edge of the black dot can also influence the servo signal, and the servo system can also be tested with the black dot test disc.     Fingerprint The test disc with fingerprints is also used to check the error correction, front-end circuit and servo system. A normal fingerprint should have no audible effect on play. A heavy fingerprint may cause an audible effect, but no track jumping is allowed.  Defects Explained Physical defects Semi-physical defects Electronic/optical defects Custom discs       © Copyright 2008, all rights reserved with Moserbaer Optical Storage designed by: cross section

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test discs , optical technology, cd mastering, dvd mastering, test discs, om-t test discs

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