Editing SD card (section)

== Relationship between bus modes and card speed classes ==
Each labeled card speed class requires a minimum bus speed mode in which it can function.  The following table illustrates this relationship in addition to which of the card capacity types are available in each bus mode.<ref>{{Cite book |url=https://www.sdcard.org/downloads/pls/pdf/?p=Part1_Physical_Layer_Simplified_Specification_Ver9.10.jpg&f=Part1PhysicalLayerSimplifiedSpecificationVer9.10Fin_20231201.pdf&e=EN_SS9_1 |title=SD Specifications Part 1 Physical Layer Simplified Specification |date=December 1, 2023 |publisher=SD Card Association |edition=9.10 |page=138}}</ref><ref>{{Cite web |title=Bus Interface Speed Standards for Large Size Data Transfer |url=https://www.sdcard.org/consumers/about-sd-memory-card-choices/bus-interface-speed-standards-for-large-size-data-transfer/ |access-date=2025-05-28 |website=SD Association |language=en-US}}</ref> Equivalent card speed classes for a given bus mode are shown side by side.
{| class="wikitable"
|+
!Bus mode
! colspan="2" |Speed classes introduced at this bus mode
!Capacity types supported
|-
! rowspan="3" |Default
| colspan="2" |Speed Class 2 (C2)
| rowspan="4" |SDSC, SDHC, SDXC, SDUC
|-
| colspan="2" |Speed Class 4 (C4)
|-
|Speed Class 6 (C6)
|Video Speed Class 6 (V6)
|-
!High Speed
|Speed Class 10 (C10)
|Video Speed Class 10 (V10)
|-
! rowspan="2" |UHS-I
| colspan="2" |UHS Speed Class 1 (U1)
| rowspan="9" |SDHC, SDXC, SDUC
|-
|UHS Speed Class 3 (U3)
|Video Speed Class 30 (V30)
|-
! rowspan="2" |UHS-II
| colspan="2" |Video Speed Class 60 (V60)
|-
| colspan="2" |Video Speed Class 90 (V90)
|-
!UHS-III
| colspan="2" |No new labeled speed classes
|-
! rowspan="4" |SD Express (PCIe)
| colspan="2" |SD Express Speed Class 150 (E150)
|-
| colspan="2" |SD Express Speed Class 300 (E300)
|-
| colspan="2" |SD Express Speed Class 450 (E450)
|-
| colspan="2" |SD Express Speed Class 600 (E600)
|}
Note that a card will only have support at a given bus mode and card speed class level if it is explicitly labeled accordingly.  In addition, some SDSC cards do support the High Speed bus, but only at Speed Class 6 and below.