et les petits détails

Bus Speed

For the sheer variety of high-performing, feature-rich devices, the SD Association introduced higher speed bus interface (I/F) and its minimum writing speed specifications for SDHC memory cards and SDXC memory cards.
Bus Interface Card Type Bus Mark Bus Speed Spec Version
Normal Speed SD, SDHC and SDXC --- 12.5MB/s 1.01
High Speed SD, SDHC and SDXC --- 25MB/s 2.00
UHS-I SDHC and SDXC 50MB/s (SDR50, DDR50)
104MB/s (SDR104)		 3.01
UHS-II SDHC and SDXC 156MB/s
312MB/s		 4.00

Marks Operable Under Applications SD Memory Card
Speed Class High Speed Bus I/F Full HD video recording
HD still consecutive recording		 SD, miniSD, microSD
SDHC, miniSDHC, microSDHC
SDXC, microSDXC
Normal Bus I/F HD ~ Full HD video recording
SD video recording
UHS Speed Class UHS-I Bus I/F
UHS-II Bus I/F		 Full higher potential of recording real-time broadcasts and capturing large-size HD videos
(UHS Speed Class1 denotes a 10 MB/s minimum write speed)		 SDHC UHS-I and UHS-II, SDXC UHS-I and UHS-II
Capable of recording 4K2K video
(UHS Speed Class 3 denotes 30 MB/s minimum write speed)