April 11, 2021

What is difference between micro SD, and micro SDHC and micro SDXC cards?

What is Micro SD?

The SD card is that the first generation of Secure Digital cards which has been developed to reinforce our experience with the MMC (MultiMediaCard) standard. Since then, mini and micro SD cards are developed to focus on mobile phones and improve their limited space for storing .

MMC – memory card standard used for storage. Same as SD card but with a good sort of storage capacities, more pins, slower transfer speed, and not as up so far as SD cards.

A micro SD memory card features a maximum space of two GB. it’s a typical size of 11 mm by 15 mm. Its maximum read and write speed is 25MB / s, which is taken into account relatively fast given its small size. it’s mainly used for mobile phones to store photos, videos and straightforward applications.

What is Micro SDHC?

Also referred to as Secure Digital High Capacity, it’s almost just like your micro SD cards, but has higher storage capacity starting from 4 GB to 32 GB. it’s still a secure digital card which has an equivalent standard size. from 11 mm by 15 mm. It also offers a better transfer rate of up to 50MB / s and up to 150MB / s.

Although SDHC cards are physically and electronically an equivalent as your standard SD cards, older host devices that support SD cards aren’t compatible together with your SDHC cards, just because SDHC cards are pre-formatted with the filing system . FAT32, while SD cards usually have a format of FAT12, FAT16 or FAT16B. However, other host devices can accommodate the new SDHC cards with a FAT32 filing system or could also be subject to a firmware update. At an equivalent time, micro SDHC host devices need to accept old SD cards, which suggests you’ll use your old SD cards with newer SDHC compatible technologies.

What is Micro SDXC?

Also referred to as Secure Digital eXtended Capacity, this micro SDXC card can support a capacity starting from 32 GB to 2 TB. Like other micro SD cards, its standard size is 11 mm by 15 mm. Its high-speed transfer rate is 50MB / s and up to 312MB / s.

While it can potentially reach 312MB / s, it all depends on its design version and sophistication speed. With version 3.0 with UHS-1 bus (ultra high speed bus), it can reach 104MB / s, and with a more moderen version 4.0 with UHS-2 introduced in June 2011, it can reach 312MB / s.

What is difference between micro SD, and micro SDHC and micro SDXC cards?

Comparison table:

Micro SDMicro SDHCMicro SDXC
2 GB of storage space4 GB to 32 GB of storage space32 GB to 200 GB of storage space (potentially 2 TB)
Uses FAT12, FAT16 or FAT16B as the file systemUses FAT 32 as the file systemUses exFAT as file system
Transfer rate is potentially 25MB / sTransfer rate of a potential of 50 MB / s to 150 MB / sTransfer rate from 50MB / s to 312MB / s

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