Patent ID: 7914870
Filing Date: 2011-03-29
Classification: G11B,Y10T

Abstract:
1. A limited-life data storage medium that in normal use is subject to rotation when read, the medium comprising: a data storage region for storing readable data; a reservoir containing a flowable agent so arranged that the agent can flow from the reservoir to permanently interfere with the readability of the data; wherein in normal use forces associated with the rotation of the disc tend to cause or assist flowing of the agent from the reservoir; wherein in a ready-to-play condition with the agent in an initial position in the reservoir the center of gravity of the disc does not coincide with the normal center of rotation of the disc, and vibration caused by the unbalanced rotation of the disc tends to cause or assist flowing of the flowable agent when the disc is played; and wherein the separation between the center of gravity and the center of rotation is greater when the flowable agent is in the initial position than when the flowable agent is in a position to interfere with the readability of the data.