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SD Card – Types / Speeds / Options

Types

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 interfaceCard logoBus logoBus speedSpec version
Default SpeedSD SDHC SDXC12.5 MByte/s1.01
High Speed25 MByte/s2.00
UHS-ISDHC SDXCI12.5 MByte/s (SDR12)
25 MByte/s (SDR25)
50 MByte/s (SDR50, DDR50)
104 MByte/s (SDR104)
3.01
UHS-IIII156 MByte/s (FD156)
312 MByte/s (HD312)
4.00[26]

X Rating:

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

Speed Class Rating:

ClassMinimum Serial Data Writing SpeedApplication
SDHC Speed Class 2.svg Class 2MB/sSD video recording
SDHC Speed Class 4.svg Class 44 MB/sHigh-definition video (HD) recording includingFull HD (from 720p to 1080p/1080i)
SDHC Speed Class 6.svg Class 66 MB/s
SDHC Speed Class 10.svg Class 1010 MB/sFull 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/sReal-time broadcasts and large HD video files (UHS bus)
UHS Class 3.png UHS Speed Class 3 (U3)30 MB/s4K video files (UHS bus)

SD compatibility table

 SDSC cardSDHC cardSDHC UHS-I cardSDHC UHS-II cardSDXC cardSDXC UHS-I cardSDXC UHS-II cardSDIO card
SDSC slotYesNoNoNoNoNoNoNo
SDHC slotYesYesYes[nb 1]Yes[nb 1]NoNoNoNo
SDHC UHS-I slotYesYesYesYes[nb 2]NoNoNoNo
SDHC UHS-II slotYesYesYesYesNoNoNoNo
SDXC slotYesYesYes[nb 1]Yes[nb 1]YesYes[nb 1]Yes[nb 1]No
SDXC UHS-I slotYesYesYesYes[nb 2]YesYesYes[nb 2]No
SDXC UHS-II slotYesYesYesYesYesYesYesNo
SDIO slotVariesVariesVariesVariesVariesVariesVariesYes

Based on Wikipedia:

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

Tools

1. Win32 Disk Imager

  • ​A Windows tool for writing images to USB sticks or SD/CF cards​
  • Download here

2. Reset SDCard

3. Test tool H2Testw

4. Test tool FakeFlashTest

5. LibreELEC USB-SD Creator