Content

SD Standard
 Form Factors
 SD Specification
 Source and Reference

SD Standard

SD standard is a portable storage standard from www.sdcard.org.

The form factors of SD Cards are full size, miniSD and microSD. miniSD is replaced by microSD,

Form Factor		SD	microSD
Dimension		32mm×24mm×2.1mm	15mm×11mm×1mm
Card Capacity Type		SD, SDHC, SDXC, SDUC
Physical	Number of pins	High speed and UHS-I: 9 pins UHS-II and UHS-III: 17 pins SD Express 1-lane: 17-19 pins SD Express 2-lane: 25-27 pins	High Speed and UHS-1: 8 pins UHS-II and UHS-III: 16 pins SD Express 1-lane: 17 pins
	Operating voltage	3.3V VDD range in the first-row: 2.7V-3.6V 1.8V VDD range in the second-row: 1.70V-1.95V
	Write-protect Switch	YES	NO

Spec. Version	Capacity & Form Factor	File System	Bus Interface	Speed Class	Others
Ver. 8.00 (2020)			SD Express PCIe Gen.4 ×1 Lane SD Express PCIe Gen.3 & 4 ×2 Lane SD Express (Ver.8.00)
Ver. 7.10 (2019) Ver. 7.00 (2018)	SDUC, microSDUC (Ver.7.00)	exFAT (Ver.7.00)	SD Express PCIe Gen.3 ×1 Lane SD Express (Ver.7.00) microSD Express (Ver.7.10)
Ver. 6.00 (2017) Ver. 5.10 (2016) Ver. 5.00 (2016)			UHS-III SDHC III, SDXC III (Ver.6.00)	Video Speed Class, V6, V10, V30, V60, V90 (Ver.5.00)	Low Voltage Signaling LV (Ver.6.00) App Performance Class A1 (Ver.5.10) A2 (Ver.6.00)
Ver. 4.20 (2013) Ver. 4.00 (2011)			UHS-II SDHC II, SDXC II (Ver.4.00)	UHS Speed Class 3 (Ver.4.20)	SMART microSD (Ver.4.00) ISDIO Wireless LAN SD (Ver.4.20)
Ver. 3.01 (2010) Ver. 3.00 (2009) Ver. 2.00 (2006) Ver. 1.20 (2005) Ver. 1.10 (2004) Ver. 1.01 (2000)	SDXC, microSDXC (Ver.3.00)	exFAT (Ver 3.00)	UHS-I SDHC I, SDXC I (Ver. 3.01) High Speed HS (Ver. 1.10) Default Speed DS (Ver. 1.01)	HHS Speed Class1 (Ver. 3.01) CLASS 10 (Ver. 3.00) CLASS 6, CLASS 4, CLASS 2 (Ver. 2.00)	SD smart (Ver. 2.00)
	SDHC, microSDHC (Ver.2.00)	FAT32 (Ver 2.00)
	SD (Ver 1.01) microSD (Ver 1.20)	FAT12/16 (Ver. 1.01)