Speed Class Standards for Video Recording - SD Association

Speed Class Standards for Video Recording - SD Association
Speed Class Standards for Video Recording
Consumers
About SD Memory Card Choices
SD, SDHC, SDXC and SDUC Card Capacity Choices
Bus Interface Speed Standards for Large Size Data Transfer
Speed Class Standards for Video Recording
Application Performance Class for Running Smartphone Apps
Low Voltage Signaling
Copyright Protection for Digital Data (CPRM)
SD Express / UHS-II Verification Program (SVP) Verified Product
#choosemicroSD
Usage Tip Videos
FAQ
Consumers
Consumers
About SD Memory Card Choices
SD, SDHC, SDXC and SDUC Card Capacity Choices
Bus Interface Speed Standards for Large Size Data Transfer
Speed Class Standards for Video Recording
Application Performance Class for Running Smartphone Apps
Low Voltage Signaling
Copyright Protection for Digital Data (CPRM)
SD Express / UHS-II Verification Program (SVP) Verified Product
#choosemicroSD
Usage Tip Videos
FAQ
SD Speed Class/UHS Speed Class/Video Speed Class
/SD Express Speed Class
Greater Performance Choices
There are four kinds of Speed Classes, “Speed Class”, “UHS Speed Class”
“Video Speed Class” and “SD Express 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 class types assures minimum sequential card access performance including multiple stream access (in SD Express Speed Classes) under defined conditions specified by the standard.
It is most important for video recording and other applications
It
is also
applicable for any write or read applications that requires an assured minimum constant sequential access performance.
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
Form Factor Size
SD
32 x 24 x 2.1 mm
microSD
11 x 15 x 1.0 mm
Speed Classes
NS mode
C2, C4, C6
HS mode
C2, C4, C6, C10,V6, V10
UHS-I mode
C2, C4, C6, C10U1, U3V6, V10, V30
UHS-II & III mode
C4, C6, C10U1, U3V6, V10, V30, V60, V90
SD Express mode
E150, E300, E450, E600
SD Speed Class
Intra video
, is a compression technique performed relative to information contained only within the current frame, and not relative to any other frame in the video sequence. Therefore, it is usually larger in size.