Optical disk holds much more, data than many magnetic disks.

光盘能够存储比磁盘多得多的数据。

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This paper is concerned with the principle of a non - contact optical instrument for measuring the surface roughness of a magnetic disk with an opto-heterodyne interferometer.

根据外差干涉计量术的原理，研制了非接触式的光外差干涉磁盘表面粗糙度测量仪。

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Databases can be stored on magnetic disk or tape, optical disk, or some other secondary storage device.

数据库可以储存在磁盘或磁带，光碟或其他间接的存储设备上。

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As can be seen, traditional film use is 15% or less with digital technologies such as optical discs, hard disk drives, magnetic tape and flash memory are the bulk of modern recording media.

FORBES: End of the Reel

Regarding the longevity of storage media many of the products that we use today, hard disk drives, flash memory, optical discs and magnetic tape will react with the ambient environment and gradually lose the data stored on them or disintegrate over time.

FORBES: Storing Information for a Thousand Years