SD SDHC SDXC

SD/SDHC/SDXC Specifications and Compatibility

Can I use an SDXC memory card with an SDHC host device?

There are three main types in the SD memory card family. SD, SD High Capacity (SDHC™), and SD Extended Capacity (SDXC™). This article details the different specifications of all three types of SD memory cards
and the speed class ratings and compatibilities that are different with each type.

Click here to jump straight to Speed Class & UHS Speed Class Ratings

Click here to jump straight to the Compatibility Summary



SD capacities range from 128MB to 2GB

Default Format: FAT16

SD cards will work in all host devices that support SD, SDHC, or SDXC


SD
High Capacity (SDHC™) card is an SD™ memory card based on the SDA 2.0 specification.

SDHC capacities range from 4GB to 32GB

Default Format: FAT32

Because SDHC works differently than standard SD cards, this new format is NOT backwards compatible with host devices that only take SD (128MB - 2GB) cards. Most readers and host devices built after 2008 should be SDHC compatible.

To ensure compatibility, look for the SDHC logo on cards and host devices (cameras, camcorders, etc.)


SD
Extended Capacity (SDXC™) card is an SD™ memory card based on the SDA 3.0 specification.

SDXC capacities range from 64GB to 2TB

Default Format: exFAT

Because SDXC uses a different file system called exFAT and it works differently than standard SD cards, this new format is NOT backwards compatible with host devices that only take SD (128MB to 2GB). Most host devices built after 2010 should be SDXC compatible. To
ensure compatibility, look for the SDXC logo on cards and host devices (cameras, camcorders, etc.). NOTE: Internal card readers on laptops from 2008 and prior may NOT support SDXC cards. SDXC cards will work in SDHC compatible readers (not SD readers)
if the computer OS supports exFAT. For more information on exFat see: Operating Systems that support the exFAT File System



Ultra High Speed, Phase I (UHS-I) bus design for SDHC and SDXC cards was added in SD spec 3.0. This is a design enhancement to increase the performance of SDHC/SDXC cards.

UHS-I specification defines two bus architecture options for up to 50MB/s (UHS-50) and 104MB/s (UHS-104) data transfer rates. These are theoretical maximum limits and actual maximum performance for a specific card is defined on it label or in advertising.

UHS is an enhancement to the original SD interface specifications. Host devices will obtain the UHS maximum speed when both the card and host device support UHS. Otherwise, the host device and card will use the slower SD maximum speed obtainable.

There is no compatibility problem using a UHS card with a non-UHS device.

Speed Class & UHS Speed Class Rating

Speed class ratings define a minimum guaranteed speed of SDHC/SDXC cards. Speed class rating is important for HD video mode or camcorders, where the device is actually saving a steady stream of data. The resolution and format of the video determines the amount
of steady stream data. You should consult your camera user manual for minimum speed class requirements for HD video modes. For a more detailed explanation of speed class see: Difference
between Speed Class, UHS Speed Class, and Speed Ratings...