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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


 
   
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