SD Card Classes

Secure Digital memory cards are a type of solid-state, non-volatile data storage media format designed for portable devices. SD cards are used by a wide variety of consumer electronics products, including digital cameras, cell phones, and PDA devices. They also come with both a write protection option and the ability to apply copy protection using content protection for recordable media or CPRM technology. Standard formats: SD
memory cards made in the original Secure Digital format can be identified by the “SD” logo on the face of the card. Standard format SD cards are designed with a storage capacity limit of 2 gigabytes of data for all SD sub-formats. Standard SD cards use the FAT16 and FAT32 system, which is the same file system that was used in Microsoft MS-DOS and Windows up to Windows XP. They can, however, be formatted to use other file systems. This format also includes miniSD and microSD subtypes. The miniSD and microSD subtypes are used by more compact devices that want to work with smaller card formats. Older devices that read SD cards are not necessarily compatible with later model formats such as Secure Digital High Capacity,

High-capacity formats:. SDHC
All SDHC card formats have a maximum storage capacity of 32GB and use FAT-32 file system. They are identified by the “SD” logo with the reversed “HC” text. Devices using the SDHC card format are compatible with the original standard SD class of cards. Like SD card, SDHC can be formatted to use other file system types. MiniSDHC and microSDHC cards are the same size as standard miniSD and microSD cards.

SDXC Formats
SDXC cards universally have a potential capacity of 2 terabytes of data storage. The full-size SDXC card is the same size as the SDHC and full-size SD card formats, and devices that use SDXC cards are backward compatible with SD and SDHC cards of the same physical size or smaller sizes when used in adapters. SDXC use Microsoft’s exFAT file system format, but can be formatted to use any other operating system that can handle 2TB of storage.
Speed ​​​​Class and ratings
Another way to classify SD cards is by how quickly they transfer data to and from consumer devices. According to SanDisk , speed classes for SD and SDHC cards are defined by a variety of numbers from 2 to 10 . Speed ​​ratings are defined by data transfer: for example, a speed class of 2 means a data transfer speed rating of 2 megbaytes per second, while a speed class of 10 means a speed of 10 MB per second. For SDXC cards there is the Ultra High Speed​​bus speed class, which Kingston Technology indicates has a current maximum speed rating of 104MB per second in a speed class of 10.

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