Speed Class Standards for Video Recording

SD Speed Class/UHS Speed Class/Video Speed Class

Greater Performance Choices

There are three kinds of Speed Classes, "Speed Class", "UHS Speed Class" and "Video Speed Class."

As a characteristic of flash memory, actual transfer speed varies. Variable speeds are difficult to reliably record streaming content such as video because it requires a constant writing speed. All Speed Classes provide the constant speed necessary for video recording by designating a minimum writing performance so that minimum and constant speed could be achieved for camcorders, video recorders and other devices with video recording capabilities under the conditional write operation specified in the standard.

  SD Standard SDHC Standard SDXC Standard SDUC Standard
Capacity up to 2GB more than 2GB
up to 32GB
more than 32GB
up to 2TB
more than 2TB
up to 128TB
File System FAT 12, 16 FAT 32 exFAT exFAT
SD Logo SD SDHC SDXC SDUC
Card Specifications SD 32 x 24 x 2.1 mm, Approx. 2g
microSD 11 x 15 x 1.0 mm, Approx. 0.5g
Speed Classes Normal
Speed
mode
C2, C4, C6
High
Speed
mode
C2, C4, C6, C10,
V6, V10
UHS-I
mode
--- C2, C4, C6, C10
U1, U3
V6, V10, V30
UHS-II
mode
--- C4, C6, C10
U1, U3
V6, V10, V30, V60, V90
UHS-III
mode
--- C4, C6, C10
U1, U3
V6, V10, V30, V60, V90

SD Speed Class

SD Speed Class

Video Format

Video Format