What Are The SD Card Classes:
Table – 01:
|SD||Secure Digital Card
Storage Capacity = 0 - 2 GB
|SDHC||Secure Digital High Capacity Card
Storage Capacity = 4 GB - 32 GB
|SDXC||Secure Digital Extended Capacity Card
Storage Capacity = 32 GB - 2 TB
|SDUC||Secure Digital Ultra Capacity Card
Storage Capacity = 2 TB - 128 TB
|CARD TYPE:||DEVICE COMPATIBILITY:|
SD SDHC SDXC
|APPLICATION FOR THE SD CARD:||MINIMUM SPECIFICATION FOR THE SD CARD:|
|JPEG Photography||16 GB ≫, 30 MB/s, Class 10|
|RAW Photography And Full HD Videography||32 GB ≫, 45 MB/s, U1|
|4K Videography||64 GB ≫, 60 MB/s U3|
|Markings On Your Device (e.g. Cameras, mobiles, laptops, tablets, PDAs, etc)||Markings On Your SD Card|
|Manufacturers of devices quote WRITE speed in Megabits per second.|
See the below examples:
|Manufacturers of SD cards quote READ speed in Megabytes per second.
See the below examples:
|Megabits per second 1Mb/s = 0.125 MB/s Megabytes per second
Megabits per second 8 Mb/s = 1 MB/s Megabytes per second
Megabits per second 90 Mb/s = 11.25 MB/sMegabytes per second
|SD Card - Year Released = 1999 - 2002 - Card Physical Size = Length 32.0 mm Width 24.0 mm Thickness 2.1 mm
Mini SD Card - Year Released = 2003 - Card Physical Size = Length 21.0 mm Width 20. mm Thickness 0.5 mm
Micro SD Card - Year Released = 2005 - 2005 - Card Physical Size = Length 11.0 mm Width 15.0 mm Thickness 1.0 mm
SDHC Card and SDIO - Year Released = 2005 - 2005 - Card Physical Size = Length 32.0 mm Width 24.0 mm Thickness 2.1 mm
SDXC Card and SDIO - Year Released = 2005 - 2005 - Card Physical Size = Length 32.0 mm Width 24.0 mm Thickness 2.1 mm
Nano SD (Huawei Only) - Year Released = 2018 - Card Physical Size = Length 11.0 mm Width 6.2 mm Thickness 0.5 mm
SDUC Card and SDIO - Year Released = 2018 - Card Physical Size = Length 32.0 mm Width 24.0 mm Thickness 0.5 mm
|Depending on the SD card purchased and the manufactory, SD cards may have some or all of the features below:
1) Dust Proof
2) X-Ray Proof
3) Shock Proof
4) Water Proof
5) Magnetic Proof
6) Toughened SD Card*
* A Tough SD Card is a hardened SD card that is ribless and 18 times stronger than a standard SD card. Tough SD cards are drop proof from a height of 5 meters and have a 180N rating compared to 10N rating of a standard SD card. Tough SD Cards are currently only produced by Sony.
Standard SD cards are made up of three thin individual pieces, through which dust and water can enter, the joins where the three separate prices meet are like places for brakes to occur. Sony's Tough SD Card use the world’s first monolithic structure made with a completely sealed one piece moulding that leaves no empty space in the SD card, this helps protect the SD card against physical damage that can affect standard SD cards, such as a broken plastic casing, broken data protection locks and broken connector ribs etc.
Sony's Tough SD Card also supports V90, the highest standard of video speed class, currently available and can transfer data from the SD card to your device at a rate of up to 300 MB/s.
|SDIO = Secure Digital Input Output
SDIO is an interface designed as an extension for the existing SD card standard, to allow connecting different peripherals to the host with the standard SD controller. Nowadays it's extensively used to connect WiFi/Bluetooth chips on ARM boards, like Wandboard, Raspberry Pi 3/4 or Banana Pi.
The SDHC format, announced in January 2006, brought improvements such as 32 GB storage capacity and mandatory support for FAT32 file system. In April, the SDA released a detailed specification for the non-security related parts of the SD memory card standard and for the Secure Digital Input Output (SDIO) cards and the standard SD host controller.
In September 2006, SanDisk announced the 4 GB miniSDHC. Like the SD and SDHC, the miniSDHC card has the same form factor as the older miniSD card but the HC card requires HC support built into the host device. Devices that support miniSDHC work with miniSD and miniSDHC, but devices without specific support for miniSDHC work only with the older miniSD card. Since 2008, miniSD cards are no longer produced, due to market domination of the even smaller micro SD cards.
Table – 02:
|UHS Speed Class|
|Mark||Minimum Serial Data||SD Bus Mode||Application|
|U3||UHS-III||4k & 8K Videography|
|U3||30 MB/s||UHS-II||2K & 4k Videography|
|U1||10 MB/s||UHS-I||Full HD Videography
|Class 10||10 MB/s||High Speed||Full HD Videography
|Class 6||6 MB/s||Normal Speed||HD & Full HD Videography|
|Class 4||4 MB/s||Normal Speed||HD & Full HD Videography|
|Class 2||2 MB/s||Normal Speed||SD Videography|
Table – 03:
|Bus Interface||SD, SDHC, SDXC||Bus mark||Bus Speed||Spec version|
|Normal Speed||SD, SDHC, SDXC||12.5 MB/s||1.01|
|High Speed||SDHC, SDXC||25 MB/s||2.00|
|UHS-I||SD, SDHC, SDXC||I, SDHC I, Micro SDXC I||50 MB/s, (SDR50, DDR50), 104 MB/s (SDR104)||3.01|
|UHS-II||SDHC, SDXC||II, SDHC II, SDXC II,||156 MB/s, 312 MB/s||4.00|
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