| 摘要 |
The invention consists of a combination of products including a optical data-media discs encased in a plastic cartridge or unincased in larger diameter from 5.25″ to 9″ discs with standard size and oversize versions with a sliding plastic or aluminum spring loaded doors to exclude dust, dirt, physical damage, and white color to reduce heat absorption, etc. Cartridge protective doors including spring operated side sliding and end sliding opening dust covers and fixed clear lens view window. The oversized discs provide security through non-interchangeability with standard sized discs. Also, the use of various shapes and sizes of holes through the case allow security through exclusion as does the cartridge itself.
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