Limited life medium
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United States of America Patent
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Mar 29, 2011
Grant Date -
May 22, 2008
app pub date -
Nov 13, 2007
filing date -
Nov 21, 2006
priority date (Note) -
Expired
status (Latency Note)
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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.
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