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SD Card – Types / Speeds / Options

SDSC – First generation, Secure Digital Standard Capacity.

Ver 2.0. Speed 25 MB/Sec.

SDHC – Second generation, Secure Digital High Capacity. Up to 32 GB.

Ver 2.0. Speed 25 MB/Sec.

Ver 3.0. Ultra high speed I 50 to 100 MB/Sec.

SDXC – Third generation, Secure Digital eXtended Capacity. Up to 2 TB.

Ver 2.0. Speed 25 MB/Sec.

Ver 3.0. Ultra high speed I 50 to 100 MB/Sec.

Ver 4.0. Ultra high speed II 156 to 312 MB/Sec.

Bus interface Card logo Bus logo Bus speed Spec version
Default Speed SD SDHC SDXC 12.5 MByte/s 1.01
High Speed 25 MByte/s 2.00
UHS-I SDHC SDXC I 12.5 MByte/s (SDR12)
25 MByte/s (SDR25)
50 MByte/s (SDR50, DDR50)
104 MByte/s (SDR104)
3.01
UHS-II II 156 MByte/s (FD156)
312 MByte/s (HD312)
4.00[26]

 

X Rating:

Rating Approx.
(MB/s)
Comparable
Speed Class
16× 2.34 SDHC Speed Class 2.svg (13×)
32× 4.69 SDHC Speed Class 4.svg (27×)
48× 7.03 SDHC Speed Class 6.svg (40×)
100× 14.6 SDHC Speed Class 10.svg (67×)

 

Speed Class Rating:

Class Minimum Serial Data Writing Speed Application
SDHC Speed Class 2.svg Class 2 MB/s SD video recording
SDHC Speed Class 4.svg Class 4 4 MB/s High-definition video (HD) recording includingFull HD (from 720p to 1080p/1080i)
SDHC Speed Class 6.svg Class 6 6 MB/s
SDHC Speed Class 10.svg Class 10 10 MB/s Full HD (1080p) video recording and consecutive recording of HD stills (high-speed data bus)
UHS Class 1.png UHS Speed Class 1 (U1) 10 MB/s Real-time broadcasts and large HD video files (UHS bus)
UHS Class 3.png UHS Speed Class 3 (U3) 30 MB/s 4K video files (UHS bus)

SD compatibility table

SDSC card SDHC card SDHC UHS-I card SDHC UHS-II card SDXC card SDXC UHS-I card SDXC UHS-II card SDIO card
SDSC slot Yes No No No No No No No
SDHC slot Yes Yes Yes[nb 1] Yes[nb 1] No No No No
SDHC UHS-I slot Yes Yes Yes Yes[nb 2] No No No No
SDHC UHS-II slot Yes Yes Yes Yes No No No No
SDXC slot Yes Yes Yes[nb 1] Yes[nb 1] Yes Yes[nb 1] Yes[nb 1] No
SDXC UHS-I slot Yes Yes Yes Yes[nb 2] Yes Yes Yes[nb 2] No
SDXC UHS-II slot Yes Yes Yes Yes Yes Yes Yes No
SDIO slot Varies Varies Varies Varies Varies Varies Varies Yes

 

Based on Wikipedia:

https://en.wikipedia.org/wiki/Secure_Digital

Sd Card Testing:

H2Testw

https://sosfakeflash.wordpress.com/2008/09/02/h2testw-14-gold-standard-in-detecting-usb-counterfeit-drives/

Direct download of H2testw 1.4

FakeFlashTest

http://www.rmprepusb.com/tutorials/-fake-usb-flash-memory-drives

Direct download FFT