MFDigital CD DVD Information Library: CD Manufacturing > Quality Assurance

MFDigital CD DVD Information Library

Thursday, June 24, 2004

CD Manufacturing > Quality Assurance > QA in Mastering

Quality Assurance in Mastering

The purpose of mastering is to produce perfect stampers with good pit geometry so that replicated discs meet industry standards. To ensure high quality levels:

Stampers are played on a disc stamper player.
The first disc to be pressed is verified against the source to ensure that it has been mastered without errors.
The pit geometry on a metalised glass master can be inspected using a suitable high power microscope.
Each maiden stamper production run has a PQ test carried out to ensure that the start and finish times of all tracks correspond to the values in the TOC.

Errors which can occur during mastering include variations in track pitch and linear velocity and pit geometry which can produce high jitter in the moulded discs. In addition poor stamper finishing can result in discs with eccentricity and/or unbalance out of specification.

- posted by J @ 7:23 AM

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