The read-only optical disks refer to those with stored contents;

其中，只读类光盘是指存储有内容的光盘；

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The optical disks with the protect film still read and write the information normally.

覆盖保护膜后的光盘仍能够正常读写和存储信息。

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Normally, assured destruction means degaussing magnetic media or shredding optical disks.

在一般情况下，确保资料销毁就是采取消磁或切碎光盘的方法。

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This overall decline in optical disks distribution is the result of fast and convenient on-line distribution.

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But Kodak also plunged into the fiercely competitive digital storage game with recordable CD-ROMs (Photo CD) and optical disks.

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Data was stored on rewritable magneto-optical disks 2.5in (64mm) in diameter housed for protection in a square plastic shell.

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