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Capacity (SD/SDHC/SDXC)

There are three standards for capacity:

SD - Up to 2GB SD memory card using FAT 12 and 16 file systems
SDHC - over 2GB-32GB SDHC memory card using FAT32 file system
SDXC - over 32GB-2TB SDXC memory card using exFAT file system
  SD SDHC SDXC
Capacity up to 2GB more than 2Gb
up to 32GB		 more than 32GB
up to 2TB
File System FAT 12, 16 FAT 32 exFAT
SD Memory Cards SD SDHC SDXC
Card form factor full 32 x 24 x 2.1 mm, Approx 2g
miniSD 20 x 21.5 x 1.4 mm, Approx 1g
microSD 11 x 15 x 1.0 mm, Approx 0.5g
SD Host Products SD SDHC SDXC
Bus Speed Normal Speed (NS)
High Speed (HS)		 NS, HS
UHS-I		 NS, HS
UHS-I
Speed Classes NS, HS mode Speed Class (o) Speed Class (M) Speed Class (M)
UHS-I mode   Speed Class (O)
UHS Speed Class (O)		 Speed Class (O)
UHS Speed Class (O)

(O): Option, (M): Mandatory

For more details on the physical standards of SD, please find the following matrixes.

  Full size SD miniSD microSD
Size SD Card SD Card SD Card
Card Type SD, SDHC, SDXC SD, SDHC SD, SDHC, SDXC
Physical Area 768 mm2 (100) 430 mm2 165 mm2
Card Volume 1,613 mm3 (100) 602 mm3 165 mm3
Thickness 2.1 mm 1.4 mm 1.0 mm
Weight Approx. 2g Approx. 1g Approx. 0.5g
Number of pins 9 pins 11 pins 8 pins
File System FAT16/32 FAT16/32 FAT16/32
Operating Voltage 2.7V - 3.6V 2.7V - 3.6V 2.7V - 3.6V
Write-protect Switch YES NO NO
Copyright protection CPRM (mandatory) CPRM (mandatory) CPRM (mandatory)