Side by side

CFexpress Type A versus Type B

Record the type letter and supported reader, not just the family name.

Computer-generated illustration, not a photograph. — P121 · ConnectorCFexpress Type A card interface

How they differ

CFexpress Type A card interface Confirm the Type A marking and the camera supported-media list. Generic CFexpress wording is incomplete.
CFexpress Type B card interface Read Type B on the card and the exact supported-media list; record the camera firmware requirement where one is given.

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
Field	CFexpress Type A card interface	CFexpress Type B card interface
Type	Connector	Connector
Family	Storage	Storage
Shape	card edge	card edge
Nominal contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity span	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	card (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.	card (CEB-G128)S098Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEB-G128. Documented role: card. Approximate dimensions of named CEB-G models. No XQD electrical compatibility inferred merely from shared physical form.
Key distinction	Read the type letter, not just CFexpress.	Same shell is not the same supported media.

Full evidence ledger and sources ↓

Illustrations are computer-generated with prior AI visual review; independent technical and rights review pending. A comparison is not a compatibility verdict.

This comparison stays within one evidence layer.

All selected records are Connector records. Similar layer does not mean compatible, interchangeable or safe to mate.

Families represented: Storage

Application comparison / concept only

CFexpress: read the type letter

Reader identity comes before speed claims.

CFexpress Type A →CFexpress Type B →

Not a general compatibility verdict. S096 · S438 · S495

The reference ledger

Read the same question across.

2 selected records · 15 fields
No score. No compatibility verdict.

On a narrow screen, scroll the table sideways or open the field-by-field reading view below. Illustrations are not a size comparison.

Comparison of selected field notes; source links accompany each documented specification
What you are comparing	P121 / ConnectorCFexpress Type A card interface Identification schematic · not to scale · drawing review pending	P122 / ConnectorCFexpress Type B card interface Identification schematic · not to scale · drawing review pending
Layer	Connector	Connector
Key distinction	Read the type letter, not just CFexpress.	Same shell is not the same supported media.
Nominal contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity span	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Populated contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact pitch	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Dimensions / axis	20 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.	29.6 mm approximate overall width (CEB-G128); 38.5 mm approximate overall length (CEB-G128); 3.8 mm approximate overall thickness (CEB-G128)S098Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEB-G128. Documented role: card. Approximate dimensions of named CEB-G models. No XQD electrical compatibility inferred merely from shared physical form.
Connector role	card (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.	card (CEB-G128)S098Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEB-G128. Documented role: card. Approximate dimensions of named CEB-G models. No XQD electrical compatibility inferred merely from shared physical form.
Coupling / latch	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Keying / polarization	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Documented identification	The CompactFlash Association distinguishes the smaller Type A form from Type B.C121A	The CompactFlash Association states that Type B and XQD share a form factor and connector, with camera support conditional on implementation.C122A
Important distinction	CFexpress uses PCI Express with NVMe protocols.C121B	Sony labels its CEB-G card examples CFexpress Type B with a PCI Express interface.C122B
Documented distinction	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	CFA describes CFexpress Type B as using two PCIe lanes and retaining the same dimensions and connector as XQD. It separately makes camera support conditional on implementation or a manufacturer update.C122C
Evidence	C121A,C121B,C121C,C121D → Independent review pending	C122A,C122B,C122C,C122D → Independent review pending

Read field by field — no sideways scrolling

The same selected records, fields, values and source links as the table. Missing fields remain non-equivalent; no values are merged.

Layer

CFexpress Type A card interfaceP121 / Connector: Connector
CFexpress Type B card interfaceP122 / Connector: Connector

Key distinction

CFexpress Type A card interfaceP121 / Connector: Read the type letter, not just CFexpress.
CFexpress Type B card interfaceP122 / Connector: Same shell is not the same supported media.

Nominal contacts

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Positions / cavity span

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Populated contacts

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact rows

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact pitch

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Dimensions / axis

CFexpress Type A card interfaceP121 / Connector: 20 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.
CFexpress Type B card interfaceP122 / Connector: 29.6 mm approximate overall width (CEB-G128); 38.5 mm approximate overall length (CEB-G128); 3.8 mm approximate overall thickness (CEB-G128)S098Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEB-G128. Documented role: card. Approximate dimensions of named CEB-G models. No XQD electrical compatibility inferred merely from shared physical form.

Connector role

CFexpress Type A card interfaceP121 / Connector: card (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.
CFexpress Type B card interfaceP122 / Connector: card (CEB-G128)S098Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. CEB-G128. Documented role: card. Approximate dimensions of named CEB-G models. No XQD electrical compatibility inferred merely from shared physical form.

Coupling / latch

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Keying / polarization

CFexpress Type A card interfaceP121 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFexpress Type B card interfaceP122 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Documented identification

CFexpress Type A card interfaceP121 / Connector: The CompactFlash Association distinguishes the smaller Type A form from Type B.C121A
CFexpress Type B card interfaceP122 / Connector: The CompactFlash Association states that Type B and XQD share a form factor and connector, with camera support conditional on implementation.C122A

Important distinction

CFexpress Type A card interfaceP121 / Connector: CFexpress uses PCI Express with NVMe protocols.C121B
CFexpress Type B card interfaceP122 / Connector: Sony labels its CEB-G card examples CFexpress Type B with a PCI Express interface.C122B

Documented distinction

CFexpress Type A card interfaceP121 / Connector: 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
CFexpress Type B card interfaceP122 / Connector: CFA describes CFexpress Type B as using two PCIe lanes and retaining the same dimensions and connector as XQD. It separately makes camera support conditional on implementation or a manufacturer update.C122C

Evidence

CFexpress Type A card interfaceP121 / Connector: C121A,C121B,C121C,C121D →
Independent review pending
CFexpress Type B card interfaceP122 / Connector: C122A,C122B,C122C,C122D →
Independent review pending

Your next step

Use the distinction in context.

Open the field notes Read source-linked facts and limitations.Compare another pair Start from a common confusion.Check a connection A comparison is not a compatibility verdict.

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CFast versus CFexpress Type BSATA CFast is not PCIe/NVMe CFexpress. Check the full card and reader names before checking performance.CompactFlash versus CFexpress Type BPATA CompactFlash and PCIe/NVMe CFexpress are different card families; a CF reader label is incomplete.XQD versus CFexpress Type BA shared form factor does not establish device or firmware support.Mini-SAS HD vs OCuLinkMini-SAS HD and OCuLink are different connector families used in high-speed internal links. Physical resemblance is not evidence of mating or protocol compatibility.Mini-SAS HD vs SlimSASMini-SAS HD and SlimSAS are different internal high-density connector families. Match the named SFF form and system documentation, not the general SAS label.SATA data vs SATA powerSATA data and SATA power are separate connectors with different roles and contact counts. Sharing the SATA name does not make them substitutes.

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Evidence behind this page

Scope first. Source second. Approval separate.

4 linked sources · 8 scoped claims · 0 sources with inspection/access flags.

Page scope: Evidence behind the compared records; the editorial comparison still needs separate review.

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 4 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

S098 · CFexpress Type B CEB-G support — interface identity

Sony · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: Sony CEB-G examples explicitly identify CFexpress Type B and PCI Express.

Not established / limitations: Japanese primary text inspected. Model-specific performance and dimensions are not transferred to every card.

Locator: CEB-G product information; interface row

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).

S495 · MRW-G1 CFexpress Type B / XQD reader supported cards

Sony · Unclassified publisher domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Named reader support only, not all XQD readers, all camera slots or all brands.

Not established / limitations: Named example only. No universal compatibility or publication approval. Raw-byte acquisition status is recorded separately.

Locator: Product description and FAQ: supported Sony CFexpress Type B and Sony XQD G/M series cards.

Trace 8 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)

C122A · P122

The CompactFlash Association states that Type B and XQD share a form factor and connector, with camera support conditional on implementation.

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

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

C122B · P122

Sony labels its CEB-G card examples CFexpress Type B with a PCI Express interface.

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

Source links: S098 · Evidence trail → (private workspace)

C122C · P122

CFA describes CFexpress Type B as using two PCIe lanes and retaining the same dimensions and connector as XQD. It separately makes camera support conditional on implementation or a manufacturer update.

Claim scope: Card Types public text: form-factor footnote and A/B FAQ; no dimensions or speed table transcribed.

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

C122D · P122

Sony lists its CFexpress Type B memory cards for the MRW-G1 reader.

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

Source links: S495 · Evidence trail → (private workspace)

Prepare this page for review →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.