Limited life medium

Details Limited life medium Limited life medium

2011-03-29

2011-03-29

Mulvaney, Elizabeth (Department: 1785)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C430S270110

Reexamination Certificate

active

07914870

ABSTRACT:
A limited-life storage medium comprises a flowable agent. In one example, the storage medium is an optical disc. In a ready-to-read condition, the center of mass of the disc does not coincide with the center of rotation. When the disc is read, the unbalanced rotation of the disc causes vibration that migrates the flowable agent into contact with a metal data-carrying layer, where the flowable agent interferes with the readability of the data so as to limit the useful life of the disc. The movement of the flowable agent improves the balance of the disc, and reduces the vibration.

REFERENCES:
patent: 6011772 (2000-01-01), Rollhaus et al.
patent: 6468619 (2002-10-01), Larroche
patent: 2005/0195728 (2005-09-01), Larroche
ECMAStandard ECMA-267, 3rdEdition, Apr. 2001-pp. 1-86.

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