There are three standards for capacity:
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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 |
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SDXC standard - over 32GB-2TB SDXC memory card using exFAT file system |
| SD Standard | SDHC Standard | SDXC Standard | ||
| 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 Logo |  |
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| Card Specifications | SD | 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 | |||
| Bus Speed | Normal Speed (NS) High Speed (HS) |
NS, HS UHS-I |
NS, HS UHS-I |
|
| Speed Classes | NS, HS mode | Speed Class | Speed Class | Speed Class |
| UHS-I mode | Speed Class UHS Speed Class |
Speed Class UHS Speed Class |
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For more details on the physical standards of SD standards, please find the following matrixes.
| SD | miniSD | microSD | ||
| Size |  |
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|
| 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 | CPRM | CPRM | |
