Quality oriented companies have a clearly defined Corrective Action process, and they measure closure of corrective action. Customers who have experienced problems may demand to see a CAR in order to continue the relationship. This is in contrast to CD-ROM where the media is extruded during the process and data is molded into the newly extruded plastic surface of the disc. It is typically used for test runs and other small releases. Calibration ensures that equipment and measurements correspond to universal standards.
Equipment needing calibration typically include scales, meters, drives, and clocks.
Some computer turnkey manufacturers get most of their materials consigned and work mostly as assembly companies. Another word for CD-sleeve. This quality measure discerns between good and bad product. You must of course identify the specification of the product accurately. To compare two different companies' DPM rate, you need to make sure that they use the same level of compliance to specifications.