龙一 发表于 2013-1-7 09:16
啥意思?
Speed Class Rating
32 GB SDHC card
The SD Association defines standard speed classes indicating minimum performance to record video. Both read and write speeds must exceed the specified value. These are defined in terms of suitability for different applications:[40]
Class 2 for SD video recording
Class 4 and 6 for high-definition video (HD) to Full HD video recording,
Class 10 for Full HD video recording and consecutive recording of HD stills
UHS Speed Class 1 for real-time broadcasts and large HD video files
The specification defines these classes in terms of performance curves that translate into the following minimum read-write performance levels on an empty card:[41]
Class Minimum performance
SDHC Speed Class 2.svg Class 2 2 MB/sec
SDHC Speed Class 4.svg Class 4 4 MB/sec
SDHC Speed Class 6.svg Class 6 6 MB/sec
SDHC Speed Class 10.svg Class 10 10 MB/sec |