| 释义 |
SD Card classes SD Card classesSD card classes designate the minimum write speed of the flash memory card for recording video. The three class types are Speed, UHS Speed and Video Speed. Devices that support any of the UHS buses also support the earlier Normal and High-speed buses. See SD Card and SD Express.
MINIMUM WRITE SPEEDMin. Bus Type WriteHighest MB/sec RecordingSpeed Class C6 Normal 6 HD C10 High-speed 10 HD UHS Speed Class (2010) U1 UHS-I/II/III 10 HD U3 UHS-I/II/III 30 4K Video Speed Class (2016) V6 UHS-I/II/III 6 HD V10 UHS-I/II/III 10 4K V30 UHS-I/II/III 30 4K V60 UHS-II/III 60 8K V90 UHS-II/III 90 8K MAXIMUM SPEED Max.Bus Type MB/sec Normal 25 UHS I 104 UHS II 312 UHS III 624 SD Express 985
 | | Speed Class Markers |
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| The C, U and V designate the speed class, while the Roman numerals are the bus type. (Images courtesy of SD Association and SanDisk Corporation.) |
 | | More Pins |
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| Starting with the UHS-II bus, the cards have a second row of pins. (Image courtesy of SD Association, www.sdcard.org) |
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