FIELD GUIDESource-led reference
Port & Cable

P070 / Storage / Standard

SD Express interface overview

SD Express introduces PCIe and NVMe operation in the SD ecosystem. The SD Association distinguishes host implementations; a PCIe-only implementation must not be assumed to accept ordinary SD-mode cards.

Also called microSD Express SD Express PCIe NVMe SD

An SD-shaped slot does not prove ordinary SD or Express support.

The useful distinction

Find the Express wording and the host implementation requirements, rather than inferring transport from the card outline.

Claim inspection dates: 2026-10-01 · Independent review pending

Standard note · not an individual product specification

The useful distinction

Understand the requirement.

SD Express introduces PCIe and NVMe operation in the SD ecosystem. The SD Association distinguishes host implementations; a PCIe-only implementation must not be assumed to accept ordinary SD-mode cards. [C070A]

Bounded facts, visible unknowns

Specifications and limits

SD Express interface overview facts and limitations
TransportPCIe / NVMe in the SD ecosystem [C070A]
Host fallbackMust be established from the host implementation [C070A]
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

No particular game console, camera, reader or card model is covered by a compatibility approval.

Before you connect

What to check

  1. Confirm whether the host explicitly supports SD Express.
  2. Check whether its documentation also supports ordinary SD modes.
  3. Verify capacity and recording requirements separately.
  4. Match exact reader, card and host documentation.
Trace a supported connection class →

Keep implementation notes visible

Save the source passage that describes accepted card types and host modes. Do not replace it with a broad claim that all newer slots accept all older cards.

Your next step

Move from the form to the requirement.

Compare this field note See the differences without assuming interchangeability.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

C070ASource checked · pending review

SD Express introduces PCIe and NVMe operation in the SD ecosystem. The SD Association distinguishes host implementations; a PCIe-only implementation must not be assumed to accept ordinary SD-mode cards.

SD Association · SD Express implementation overview ↗

Locator: Host implementation overview and PCIe-only host distinction
Access: public page. PCIe/NVMe transport and explicit host capability verification.

S045: full source recordSD Association · Bus Speed: Default, High Speed, UHS and SD Express ↗

Locator: Bus interface table; duplex explanation; final speed caveat
Access: public page. Specified bus modes and distinction from measured card performance.

S043: full source recordInspect review dependencies → (private workspace)

Claim scope: Named standard or manufacturer description only; procedural checks are editorial recommendations, not hardware tests.. Next review due 2026-12-30.

Suggest a correction to this field note →

Common questions

Questions this record can help resolve

How many contacts do SD and microSD cards have?Identify the conventional first row without assuming every SD generation has the same contact count.Do microSD Express and microSD UHS-II use the same extra contacts?Two cards can share the microSD outline without sharing their second-row geometry or host interface.

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 1 scoped claims · 0 sources with inspection/access flags.

Page scope: consumer_pilot

Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 2 source scopes, access limits and dates

S043 · Bus Speed: Default, High Speed, UHS and SD Express

SD Association · Standards-organization domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: Specified bus modes and distinction from measured card performance.

Not established / limitations: Specified bus modes and distinction from measured card performance.

Locator: Bus interface table; duplex explanation; final speed caveat

S045 · SD Express implementation overview

SD Association · Standards-organization domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: PCIe/NVMe transport and explicit host capability verification.

Not established / limitations: PCIe/NVMe transport and explicit host capability verification.

Locator: Host implementation overview and PCIe-only host distinction

Trace 1 claims to their source records

C070A · P070

SD Express introduces PCIe and NVMe operation in the SD ecosystem. The SD Association distinguishes host implementations; a PCIe-only implementation must not be assumed to accept ordinary SD-mode cards.

Claim scope: Named standard or manufacturer description only; procedural checks are editorial recommendations, not hardware tests.

Source links: S045 · S043 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.