A data carrier mounted and demounted as a unit, for example, a reel of magnetic tape, a disk pack.

可作为一个部件安装和卸下的存储数据的介质，例如，一个磁带卷，一个磁盘组。

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Ting Xu, a professor at the University of California, Berkeley and Thomas Russell, a professor at the University of Massachusetts at Amherst, have created a technique that could, theoretically, pack a disk the size of a quarter with 10.5 terabits (more than 10 trillion bits) of data, the equivalent of 250 DVDs.

FORBES: Magazine Article

In 1997 IBM harnessed the effect to produce an ultrasensitive disk drive that could pack 2.7 gigabytes of data into a square inch.

FORBES: Magazine Article