The rw parameter, which you use to indicate whether the data is being pulled in for Read or preparing for a Write operation.
rw参数，使用它指明预抓取数据是为了执行读操作，还是执行写操作。
The data on a DVD-RW disc can be erased and recorded over numerous times without damaging the medium.
DVD - RW盘上的数据可以擦掉并可多次纪录，对介质没有损伤。
The data on a DVD-RW disc can be erased and recorded over numerous times without damaging the medium.
DVD - RW盘上的数据可以擦掉并可多次纪录，对介质没有损伤。
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