Important SD Card Technical Data

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When we buy a SD card or Micro SD card, we should know its important technical data such as capability, speed and physical size. People have common misunderstanding about SD card which is only focusing on the card capability and physical size just because we can see them easily.

We can see SD card physical size (Micro or Non-macro) for sure; we can also the card capability such as 16GB, 32GB, 64GB, 128GB etc. since clear texts are marked on the card. But do you know the reading speed and writing speed of a SD card ?

We have a post “SD vs SDHC vs SDXC” previously, but we only discussed what meant SD, SDHC, SDXC which are about card capability types. Today we are going to provide all the important CD card technical data.

Actually we can also recognize SD card speed by marked text or signs since the related information are on the card with Capability text together. But the different point is that speed performance information does not be indicated using exact number text on the card.

There are two kinds of speed classes regarding SD bug generation: Speed Class and UHS Speed Class. UHS is Ultra High Speed which is a newer speed class compared to Speed Class.

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The following is the collection of important data of SD serious cards:

Main Types of SD Cards

You can see the text “Mini”, “Micro” on the card, no matter the card is SD or SDHC or SDXC.

**Full SD**	**Mini SD**	**Micro SD**

## SD Card Capability Levels:

**SD**	**SDHC**	**SDXC**
FAT16	FAT32	exFAT
128MB ~ 2GB	4GB ~ 32GB	64GB ~ 2TB

## SD Card Bus Speed:

**Bus Mark**	**Bus Speed**	**Version**	**Bus Mode**
--	12.5 MB/s	1.01	Normal Speed
--	25 MB/s	2	High Speed
	50 ~ 104 MB/s	3.01	UHS-1
	156 ~ 312 MB/s	4	UHS-II

## SD Card Writing Speed The writing speeds are average writing speed based on different speed class.

**Speed Class**	**Mini Writing Speed**	**Bus Mode**
	2 MB/s	Normal Speed
	4 MB/s	Normal Speed
	6 MB/s	Normal Speed
	10 MB/s	High Speed
	10 MB/s	UHS-I
	30 MB/s	UHS-II