However, there are many different aspencts between CD-R and DVD-R, They both need perfect quality control.
尽管CD-R和DVD-R之间存在着很多的不同，它们都需要完善的品质控制。
The article took the DVD, CD-R and CD-W for examples, and then illustrated the testing methods and functions of the test media in the mechanical, optical and electronic performance tests.
本文以DVD、CD-R、和CD-W媒体设备为例，论述了测试媒体在测试机械性能、光学性能、电子性能方面的测试方法和功能。
To protect against accidental data loss, you should backup your data frequently on more than one type of storage media such as CD-R, DVD-R.
为防止资料因意外而遗失，应经常把资料在多种储存媒体（如CD或DVD）上作备份。
To protect against accidental data loss, you should backup your data frequently on more than one type of storage media such as CD-R, DVD-R.
为防止资料因意外而遗失，应经常把资料在多种储存媒体（如CD或DVD）上作备份。
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