Capacity (SD/SDHC/SDXC/SDUC)

There are three standards for capacity:
SD SD standard - Up to 2GB SD memory card using FAT 12 and 16 file systems
SDHC SDHC standard - over 2GB-32GB SDHC memory card using FAT32 file system
SDXC SDXC standard - over 32GB-2TB SDXC memory card using exFAT file system
SDUC SDUC standard - over 2TB-128TB SDUC memory card using exFAT file system
  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 NS mode C2, C4, C6
HS 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