进行搜索、 定位及读出数据的过程。
The process of searching for, locating and reading out data.
如果——不，假如发生的话——你的电脑硬盘崩溃了不能读出数据，别急着扔掉它。
If - no, make that when - your PC's hard drive crashes and can't be read, don't be too quick to throw it out.
在数据被存储之前压缩数据，以及在从外部存储设备读出数据时将数据解压，这都需要使用一定的CPU资源。
A certain amount of CPU resource is used to compress the data before it is stored, and then to decompress the data when it is read from the external storage device.
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