Listing 26 shows how to read from external storage.
清单26展示了如何从外部存储器读取数据。
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.
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。
Listing 24 tests whether the external storage is read-only.
清单24测试外部存储器是否只可读。
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