FIELD GUIDESource-led reference
Port & Cable

P121 / Storage / Connector

CFexpress Type A card interface

Type A is the smaller of the commonly compared CFexpress A and B forms; the camera determines which type is accepted.

Also called CFexpress A CF express type A Type A camera card

Read the type letter, not just CFexpress.

Look for

Confirm the Type A marking and the camera supported-media list. Generic CFexpress wording is incomplete.

Claim inspection dates: 2026-10-03, 2026-10-08 · Independent review pending

CFexpress Type A card interface: three-quarter view. Computer-generated illustration, not a photograph.

Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

CFexpress Type A card interface: mating face. Computer-generated illustration, not a photograph.

Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

CFexpress Type A card interface: fitted in place. Computer-generated illustration, not a photograph.

Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

CFexpress Type A card interface: original recognition drawing, not to scale.

Recognition drawing Original schematic, not to scale. Drawing review pending.

Application notes / Camera media / P121

Is Type A the same choice as Type B?

FIELD NOTES 04

No: the type letter identifies a distinct form. Sony’s MRW-G2 instructions name CFexpress Type A; the MRW-G1 support statement instead names Type B and selected XQD series.

Identify first

Read the part and the device.

Read the complete card-family label and the reader model.

Still unresolved

Keep this requirement open.

Camera recording modes, approved capacities and firmware are not determined by this form comparison.

Documented support · named example only

Is Sony CFexpress Type A named in its instructions?

Yes: the retained MRW-G2 instructions name Sony CFexpress Type A.

Boundary. The instructions do not guarantee every memory card or Type B support.

Next check. Match the card to the exact reader support list.

S438 · C121D (private workspace)

Not established · named example only

Can the family name alone select the reader?

Unknown: determine Type A or Type B and the exact reader before choosing a path.

Boundary. No type, generation, recording mode or speed is inferred from an incomplete label.

Next check. Read the complete card and reader markings.

S096 · C121C (private workspace) · C122C (private workspace)

Before choosing an adapter or reader

  1. Read the card type letter.
  2. Match the exact reader’s supported-card list.
  3. Check the camera’s own recording-mode requirements separately.
Read the evidence and its scope · 3 observations

C121C (private workspace) — CFA describes CFexpress Type A as the smaller A/B form using one PCIe lane. The A/B type letter identifies a form factor; the separately described version-4 marking identifies a specification generation.

Card Types public text: Type A versus Type B and label FAQ; reinspected 2026-10-08 without changing the inherited source record.

S096

C121D (private workspace) — Sony’s MRW-G2 instructions list Sony CFexpress Type A and the stated Sony SD families, while explicitly withholding a guarantee for every memory-card type. This is named-reader scope, not support for CFexpress Type B or for all cards.

Printed 5-019-283-B1 (1), PDF page 1 English Compatible memory cards.

S438

C122D (private workspace) — Sony lists its CFexpress Type B memory cards for the MRW-G1 reader.

Sony MRW-G1 and the specified Sony card family only. No camera or other reader approval.

S495

Source interpretation is not independent engineering review, hardware testing, wiring advice or a public-release approval.

Visual reference / P121

See the envelope. Confirm the label.

Published card dimensions reveal proportion, not an approved mating drawing. Contact/key geometry is deliberately omitted.

NOMINAL / 01
CFexpress Type A: original nominal width by height envelope study, 20 by 28 mm, 2.8 mm nominal depth. Not a contact or key drawing; no host compatibility approval.
CFexpress Type A · source-supported nominal two-dimensional envelope. The outer rectangle is a size comparator only, not an exact perimeter, face layout, contact geometry or manufacturing gauge.
Nominal W × H20 × 28 mm
Nominal depth2.8 mm
Family label to checkTYPE A

What can be recognized

Smaller width-and-height envelope than Type B. The printed Type A designation—not a contact sketch—is the identifying check.

Compare the three independently named standards in the common-scale envelope study. The two-dimensional proportional outline excludes card corners, ramps, pins and insertion direction.

Still unverified

Actual corner relief, insertion key, contacts, socket tolerances, camera media modes and accepted recording rates are not established by this drawing.

Never use this outline for trial insertion, mechanical design, repair, wiring or buying a reader.

Source, geometry and image-rights boundaries

First-party reference reading 9 October 2026. This is newly authored original vector artwork derived only from nominal published W/H values. It contains no borrowed logo, product image, copyrighted engineering drawing or detailed contact geometry. Manufacturer dimensions are facts, not image reuse grants. No independent engineering or rights certification is claimed.

See existing canonical evidence: S096. This visual inspection is separate from the claim review history; source review dates were not changed.

The useful distinction

Recognize it. Then verify it.

Type A is the smaller of the commonly compared CFexpress A and B forms; the camera determines which type is accepted. [C121A]

CFexpress uses PCI Express with NVMe protocols. [C121B]

CFA describes CFexpress Type A as the smaller A/B form using one PCIe lane. The A/B type letter identifies a form factor; the separately described version-4 marking identifies a specification generation. [C121C]

Sony’s MRW-G2 instructions list Sony CFexpress Type A and the stated Sony SD families, while explicitly withholding a guarantee for every memory-card type. This is named-reader scope, not support for CFexpress Type B or for all cards. [C121D]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Dimensions / axis20 mm overall width (CEA-G160T); 28 mm overall height (CEA-G160T); 2.8 mm overall depth (CEA-G160T)S922Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEA-G160T. Documented role: card. Existing S438 is MRW-G2 reader manual5-019-283-B1(1)(2020), not a CFexpress card mechanical drawing. Reader47x18mm dimensions must not enrich the card.; Other CEA-G capacities use different interface generations; no uniform capability transferred.
Connector rolecard (CEA-G160T)S922Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEA-G160T. Documented role: card. Existing S438 is MRW-G2 reader manual5-019-283-B1(1)(2020), not a CFexpress card mechanical drawing. Reader47x18mm dimensions must not enrich the card.; Other CEA-G capacities use different interface generations; no uniform capability transferred.
ManufacturerSony (CEA-G160T)S922Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEA-G160T. Documented role: card. Existing S438 is MRW-G2 reader manual5-019-283-B1(1)(2020), not a CFexpress card mechanical drawing. Reader47x18mm dimensions must not enrich the card.; Other CEA-G capacities use different interface generations; no uniform capability transferred.
SeriesCEA-G (CEA-G160T)S922Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEA-G160T. Documented role: card. Existing S438 is MRW-G2 reader manual5-019-283-B1(1)(2020), not a CFexpress card mechanical drawing. Reader47x18mm dimensions must not enrich the card.; Other CEA-G capacities use different interface generations; no uniform capability transferred.
Exact part / implementationCEA-G160T (CEA-G160T)S922Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEA-G160T. Documented role: card. Existing S438 is MRW-G2 reader manual5-019-283-B1(1)(2020), not a CFexpress card mechanical drawing. Reader47x18mm dimensions must not enrich the card.; Other CEA-G capacities use different interface generations; no uniform capability transferred.

Not recorded: Nominal contacts, Positions / cavity span, Populated contacts, Contact rows, Contact pitch, Contact gender / arrangement, Mounting, Coupling / latch, Keying / polarization, Shell / form, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • MRW-G2 is a bounded shared-slot example, not evidence for every Type A reader, every brand of card, or a Type B adapter.
  • No independently reviewed card dimensions, contact count, contact assignments or tolerance drawing are published in this profile.
  • A bus generation, lane count, VPG class or connector shape is not measured performance or a complete compatibility verdict.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

CFexpress Type A card interface facts and limitations
Documented identificationThe CompactFlash Association distinguishes the smaller Type A form from Type B. [C121A]
Important distinctionCFexpress uses PCI Express with NVMe protocols. [C121B]
Documented distinctionCFA describes CFexpress Type A as the smaller A/B form using one PCIe lane. The A/B type letter identifies a form factor; the separately described version-4 marking identifies a specification generation. [C121C]
Documented distinctionSony’s MRW-G2 instructions list Sony CFexpress Type A and the stated Sony SD families, while explicitly withholding a guarantee for every memory-card type. This is named-reader scope, not support for CFexpress Type B or for all cards. [C121D]
Mechanical dimensionsNo independently approved mechanical dimensions. Do not use this record for fabrication or fit testing.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Record the exact device model and the label beside the port. Obtain its manual and the accessory documentation. Keep unknown properties unknown instead of filling them from a visually similar item.

Before you connect

What to check

  1. Record Type A explicitly.
  2. Check the exact camera and reader model.
  3. Document the recording mode and supported card requirements.
Trace a supported connection class →

What is not established

This field note does not approve a connection, publish a pinout or provide a measured template. Use the linked source scope and the checklist as a documentation starting point.

Your next step

Move from the form to the requirement.

Read the engineering reference Source-scoped details, orientation and explicit unknowns.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.

Back to first citation ↑
C121ASource checked · pending review

The CompactFlash Association distinguishes the smaller Type A form from Type B.

CompactFlash Association · Card types and form-factor distinctions ↗

Locator: CFexpress Form Factors; Type A versus Type B; Legacy Standards
Access: public page. No copied tables, logos, numeric throughput promises, exhaustive market status or licensed normative specification. Text-only scope.

S096: full source recordInspect review dependencies → (private workspace)

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval. Next review due 2027-01-01.

Back to first citation ↑
C121BSource checked · pending review

CFexpress uses PCI Express with NVMe protocols.

CompactFlash Association · Card types and form-factor distinctions ↗

Locator: CFexpress Form Factors; Type A versus Type B; Legacy Standards
Access: public page. No copied tables, logos, numeric throughput promises, exhaustive market status or licensed normative specification. Text-only scope.

S096: full source recordInspect review dependencies → (private workspace)

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval. Next review due 2027-01-01.

Back to first citation ↑
C121CSource checked · pending review

CFA describes CFexpress Type A as the smaller A/B form using one PCIe lane. The A/B type letter identifies a form factor; the separately described version-4 marking identifies a specification generation.

CompactFlash Association · Card types and form-factor distinctions ↗

Locator: CFexpress Form Factors; Type A versus Type B; Legacy Standards
Access: public page. No copied tables, logos, numeric throughput promises, exhaustive market status or licensed normative specification. Text-only scope.

S096: full source recordInspect review dependencies → (private workspace)

Claim scope: Card Types public text: Type A versus Type B and label FAQ; reinspected 2026-10-08 without changing the inherited source record.. Next review due 2027-01-06.

Back to first citation ↑
C121DSource checked · pending review

Sony’s MRW-G2 instructions list Sony CFexpress Type A and the stated Sony SD families, while explicitly withholding a guarantee for every memory-card type. This is named-reader scope, not support for CFexpress Type B or for all cards.

Sony · MRW-G2 Operating Instructions — 5-019-283-B1 (1) ↗

Locator: PDF page 1, English compatible cards, precautions, specifications and illustrations A–C; printed identifier 5-019-283-B1 (1).
Access: public pdf text. All cards and computers are not guaranteed. Drawing interpreted for this reader only; no manufacturer artwork copied, no card geometry or current OS certification adopted.

S438: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed 5-019-283-B1 (1), PDF page 1 English Compatible memory cards.. Next review due 2027-01-06.

Suggest a correction to this field note →

Common questions

Questions this record can help resolve

Is CFexpress Type A or B the same as its generation?Separate the physical type, specification generation, protocol and exact equipment support.Do two supported card families mean two usable slots?Distinguish alternative cards, physical slots, insertion and simultaneous access.Is VPG the same as a card’s read speed or USB speed?Check sustained-write profile requirements separately from offload claims.

Take this family into a reader workflow.

See documented support, explicit exclusions and remaining unknowns for exact readers.

Explore reader coverage →Start an unsaved worksheet

Put this field note to work.

Add to discovery trayRecord an unsaved candidate (private workspace)

Compare look-alikes: CFexpress Type A versus Type B

Candidate selection does not confirm the identity or capabilities of your physical item.

Use this reference

From identity to the right next question

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 4 scoped claims · 0 sources with inspection/access flags.

Page scope: consumer_reference_expansion

Assessment 2026-10-22 · earliest scheduled source review 2027-01-01. 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

S096 · Card types and form-factor distinctions

CompactFlash Association · Standards-organization domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: CF uses PATA; CFast uses SATA; CFexpress uses PCIe/NVMe; Type B and XQD share a form factor but camera support is conditional.

Not established / limitations: No copied tables, logos, numeric throughput promises, exhaustive market status or licensed normative specification. Text-only scope.

Locator: CFexpress Form Factors; Type A versus Type B; Legacy Standards

S438 · MRW-G2 Operating Instructions — 5-019-283-B1 (1)

Sony · Unclassified publisher domain · inspected 2026-10-08 · due 2027-01-06

Within inspection window

Scoped support: MRW-G2 shared-slot alternatives, Sony card-family wording, USB interface and supplied-cable limitations.

Not established / limitations: All cards and computers are not guaranteed. Drawing interpreted for this reader only; no manufacturer artwork copied, no card geometry or current OS certification adopted.

Locator: PDF page 1, English compatible cards, precautions, specifications and illustrations A–C; printed identifier 5-019-283-B1 (1).

Trace 4 claims to their source records

C121A · P121

The CompactFlash Association distinguishes the smaller Type A form from Type B.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S096 · Evidence trail → (private workspace)

C121B · P121

CFexpress uses PCI Express with NVMe protocols.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S096 · Evidence trail → (private workspace)

C121C · P121

CFA describes CFexpress Type A as the smaller A/B form using one PCIe lane. The A/B type letter identifies a form factor; the separately described version-4 marking identifies a specification generation.

Claim scope: Card Types public text: Type A versus Type B and label FAQ; reinspected 2026-10-08 without changing the inherited source record.

Source links: S096 · Evidence trail → (private workspace)

C121D · P121

Sony’s MRW-G2 instructions list Sony CFexpress Type A and the stated Sony SD families, while explicitly withholding a guarantee for every memory-card type. This is named-reader scope, not support for CFexpress Type B or for all cards.

Claim scope: Printed 5-019-283-B1 (1), PDF page 1 English Compatible memory cards.

Source links: S438 · 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.