There are four standards for capacity:
 |
SD standard – Up to 2GB SD memory card using FAT 12 and 16 file systems |
 |
SDHC standard – over 2GB-32GB SDHC memory card using FAT32 file system |
 |
SDXC standard – over 32GB-2TB SDXC memory card using exFAT file system |
 |
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 |  |
 |
 |
 |
|
| 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, 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 |
|||