File compression is only available on hard-disk drives.
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CD-ROMs are often used to archive data and to record music downloaded from the Internet.
A. 对
B. 错
DVDs have replaced CDs as the standard optical disc.
A. 对
B. 错
Blu-ray discs are designed for high definition and have a far greater capacity than DVDs.
A. 对
B. 错
Facebook is an example of cloud storage.
A. 对
B. 错
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