以前购买的MP 3不会自动存储到你的云驱动器中，但是你可以手动上传。

Old Amazon MP3 purchases aren't put in your Cloud Drive, only new purchases going forward (though you can manually upload).

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4 MM设备类——4 MM磁带驱动器(手动驱动)的设备类将定义为4mmdevclass。

4mm device class - The device class for 4mm Tape drive (manual drive) will be defined as 4mmdevclass.

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4mm库——在手动磁带库中定义4 MM磁带驱动器。

4mm library - Define the 4mm tape drive in a manual tape library.

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