Editing SD card (section)

===Compatibility===
Host devices that comply with newer versions of the specification provide [[backward compatibility]] and accept older SD cards.<ref name="sdcard.org"/> For example, SDXC host devices accept all previous families of SD memory cards, and SDHC host devices also accept standard SD cards.

Older host devices generally do not support newer card formats, and even when they might support the bus interface used by the card,<ref name=sdcard_using_sdxc/> there are several factors that arise:
* A newer card may offer greater [[#Cpcty|capacity]] than the host device can handle (over 4&nbsp;GB for SDHC, over 32&nbsp;GB for SDXC).
* A newer card may use a [[#Filesys|file system]] the host device cannot navigate ([[FAT32]] for SDHC, [[exFAT]] for SDXC)
* Use of an SDIO card requires the host device be designed for the input/output functions the card provides.
* The hardware interface of the card was changed starting with the version 2.0 (new high-speed bus clocks, redefinition of [[#Storage capacity calculations|storage capacity bits]]) and [[#SDHC|SDHC]] family (ultra-high speed (UHS) bus)
* UHS-II has physically more pins but is backwards compatible to UHS-I and non-UHS for both slot and card.<ref name="sda_bus_speed"/>
* Some vendors produced SDSC cards above 1&nbsp;GB before the SDA had standardized a method of doing so.

{| class="wikitable"
|+ SD compatibility table
! {{Diagonal split header 2|Slot|Card}}
! scope="col" | SDSC
! scope="col" | SDHC
! scope="col" | SDHC<br />UHS
! scope="col" | SDXC
! scope="col" | SDXC<br />UHS
! scope="col" | SDIO
|-
! style="text-align:left;" | SDSC
| {{Partial}}{{Efn|name=sdsccompat|See [[#Storage_capacity_and_compatibilities|discussion about storage capacity and compatibilities]].}} || {{Partial|FAT16, < 4&nbsp;GB}}{{Efn|name=sdsccompat}} || {{Partial|FAT16, < 4&nbsp;GB}}{{Efn|name=sdsccompat}} || {{No}} || {{No}} || {{No}}
|-
! style="text-align:left;" | SDHC
| {{Yes}} || {{Yes}} || {{good|In non-UHS mode}} || {{Partial|FAT32}} || {{Partial|FAT32 in non-UHS mode}} || {{No}}
|-
! style="text-align:left;" | SDHC UHS
| {{good|In non-UHS mode}} || {{good|In non-UHS mode}} || {{Yes|In UHS mode}} || {{Partial|FAT32 in non-UHS mode}} || {{Partial|FAT32 in UHS mode}} || {{No}}
|-
! style="text-align:left;" | SDXC
| {{Yes}} || {{Yes}} || {{good|In non-UHS mode}} || {{Yes}} || {{good|In non-UHS mode}} || {{No}}
|-
! style="text-align:left;" | SDXC UHS
| {{good|In non-UHS mode}} || {{good|In non-UHS mode}} || {{Yes|In UHS mode}} || {{good|In non-UHS mode}}|| {{Yes|In UHS mode}} || {{No}}
|-
! style="text-align:left;" | SDIO
| {{partial|Varies}} || {{partial|Varies}} || {{partial|Varies}} || {{partial|Varies}} || {{partial|Varies}} || {{Yes}}
|}