FIELD GUIDESource-led reference
Port & Cable

P141 / Memory cards / Guide

Recording support is not the same as offload support

Family support does not establish a recording mode or sustained throughput.

The useful distinction

The media worksheet records family-level documentation only. It does not decide whether a card can sustain a camera format or estimate end-to-end copy performance.

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

Guide note · not an individual product specification

The useful distinction

Understand the requirement.

A camera recording requirement and a reader transfer requirement answer different questions. [C141A]

Canon EOS R5 Mark II specifications distinguish CFexpress Type B Card 1 from SD-family Card 2 and impose additional media requirements. [C141B]

CFA defines VPG in terms of minimum sustained write performance for video recording. A card’s peak read figure and a reader’s USB interface label answer different questions. [C141C]

CFA warns that VPG Profile 5 is not backward compatible with Profile 4: VPG800 or VPG1600 alone does not establish a mode requiring VPG200 or VPG400. Higher-class substitution is described within a profile, and dual-profile certification is a separate condition. [C141D]

CFA maintains a certified-card register because a displayed VPG logo may be misused. Check the exact card’s certification and the camera mode rather than treating an unfamiliar label or larger number as approval. [C141E]

Bounded facts, visible unknowns

Specifications and limits

Recording support is not the same as offload support facts and limitations
Scoped documentationSony ILCE-7M4 usable-card documentation separates card families from movie recording requirements. [C141A]
Scoped documentationCanon EOS R5 Mark II specifications distinguish CFexpress Type B Card 1 from SD-family Card 2 and impose additional media requirements. [C141B]
Documented distinctionCFA defines VPG in terms of minimum sustained write performance for video recording. A card’s peak read figure and a reader’s USB interface label answer different questions. [C141C]
Documented distinctionCFA warns that VPG Profile 5 is not backward compatible with Profile 4: VPG800 or VPG1600 alone does not establish a mode requiring VPG200 or VPG400. Higher-class substitution is described within a profile, and dual-profile certification is a separate condition. [C141D]
Documented distinctionCFA maintains a certified-card register because a displayed VPG logo may be misused. Check the exact card’s certification and the camera mode rather than treating an unfamiliar label or larger number as approval. [C141E]
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

A family name is a starting point. Consult the current manufacturer’s exact-card and firmware guidance before making a recording commitment.

Before you connect

What to check

  1. Check camera, slot, recording format and exact card independently.
  2. Use the reader documentation for transfer requirements.
  3. Do not infer measured speed from an interface label.
Trace a supported connection class →

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.

C141ASource checked · pending review

Sony ILCE-7M4 usable-card documentation separates card families from movie recording requirements.

Sony · ILCE-7M4 usable memory cards ↗

Locator: Usable memory cards; movie recording tables; notes
Access: public page. Documentation-only family and port scope; no physical test, current stock or price check, measured performance, complete card list, or independent approval.

S116: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact documented product and family scope; no physical test, exact-card certification or end-to-end approval.. Next review due 2027-01-01.

C141BSource checked · pending review

Canon EOS R5 Mark II specifications distinguish CFexpress Type B Card 1 from SD-family Card 2 and impose additional media requirements.

Canon · EOS R5 Mark II support specifications ↗

Locator: Specifications; recording media
Access: public page. Documentation-only family and port scope; no physical test, current stock or price check, measured performance, complete card list, or independent approval.

S120: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact documented product and family scope; no physical test, exact-card certification or end-to-end approval.. Next review due 2027-01-01.

C141CSource checked · pending review

CFA defines VPG in terms of minimum sustained write performance for video recording. A card’s peak read figure and a reader’s USB interface label answer different questions.

CompactFlash Association · Video Performance Guarantee — profiles, classes and camera modes ↗

Locator: Public explanation and FAQ: minimum sustained write, VPG-5 versus VPG-4, within-profile classes, dual-profile labeling and certified-card register. Inspected 2026-10-08.
Access: public page. No normative test procedure, benchmark, logo asset or copied class table. No certification lookup performed for a user card; camera mode and exact product still require checking.

S441: full source recordSony · 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: Public VPG explanation and MRW-G2 interface example; no benchmark or automatic camera qualification.. Next review due 2027-01-06.

C141DSource checked · pending review

CFA warns that VPG Profile 5 is not backward compatible with Profile 4: VPG800 or VPG1600 alone does not establish a mode requiring VPG200 or VPG400. Higher-class substitution is described within a profile, and dual-profile certification is a separate condition.

CompactFlash Association · Video Performance Guarantee — profiles, classes and camera modes ↗

Locator: Public explanation and FAQ: minimum sustained write, VPG-5 versus VPG-4, within-profile classes, dual-profile labeling and certified-card register. Inspected 2026-10-08.
Access: public page. No normative test procedure, benchmark, logo asset or copied class table. No certification lookup performed for a user card; camera mode and exact product still require checking.

S441: full source recordInspect review dependencies → (private workspace)

Claim scope: Public FAQ on VPG-5 versus VPG-4 and dual-profile labeling; no individual card certified by this reference.. Next review due 2027-01-06.

C141ESource checked · pending review

CFA maintains a certified-card register because a displayed VPG logo may be misused. Check the exact card’s certification and the camera mode rather than treating an unfamiliar label or larger number as approval.

CompactFlash Association · Video Performance Guarantee — profiles, classes and camera modes ↗

Locator: Public explanation and FAQ: minimum sustained write, VPG-5 versus VPG-4, within-profile classes, dual-profile labeling and certified-card register. Inspected 2026-10-08.
Access: public page. No normative test procedure, benchmark, logo asset or copied class table. No certification lookup performed for a user card; camera mode and exact product still require checking.

S441: full source recordInspect review dependencies → (private workspace)

Claim scope: VPG-Certified Media Cards section; no named-card database lookup or counterfeit identification performed.. 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.Is VPG the same as a card’s read speed or USB speed?Check sustained-write profile requirements separately from offload claims.

Put this checklist to work.

Choose the exact card family, reader and optional camera slot. Documentation stays separate from physical testing.

Open the card-reader worksheet →

Evidence behind this page

Scope first. Source second. Approval separate.

4 linked sources · 5 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 4 source scopes, access limits and dates

S116 · ILCE-7M4 usable memory cards

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

Within inspection window

Scoped support: ILCE-7M4 supports CFexpress Type A and SD families subject to recording-mode requirements; CFexpress Type B is explicitly not supported. Family support is not approval for every recording format.

Not established / limitations: Documentation-only family and port scope; no physical test, current stock or price check, measured performance, complete card list, or independent approval.

Locator: Usable memory cards; movie recording tables; notes

S120 · EOS R5 Mark II support specifications

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

Within inspection window

Scoped support: EOS R5 Mark II: Card 1 CFexpress Type B; Card 2 SD/SDHC/SDXC with UHS-II support. Capacity, specification and recording-mode requirements must be checked separately.

Not established / limitations: Documentation-only family and port scope; no physical test, current stock or price check, measured performance, complete card list, or independent approval.

Locator: Specifications; recording media

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).

S441 · Video Performance Guarantee — profiles, classes and camera modes

CompactFlash Association · Standards-organization domain · inspected 2026-10-08 · due 2027-01-06

Within inspection window

Scoped support: VPG class meaning and profile-bound compatibility distinctions, not certification of any named card.

Not established / limitations: No normative test procedure, benchmark, logo asset or copied class table. No certification lookup performed for a user card; camera mode and exact product still require checking.

Locator: Public explanation and FAQ: minimum sustained write, VPG-5 versus VPG-4, within-profile classes, dual-profile labeling and certified-card register. Inspected 2026-10-08.

Trace 5 claims to their source records

C141A · P141

Sony ILCE-7M4 usable-card documentation separates card families from movie recording requirements.

Claim scope: Exact documented product and family scope; no physical test, exact-card certification or end-to-end approval.

Source links: S116 · Evidence trail → (private workspace)

C141B · P141

Canon EOS R5 Mark II specifications distinguish CFexpress Type B Card 1 from SD-family Card 2 and impose additional media requirements.

Claim scope: Exact documented product and family scope; no physical test, exact-card certification or end-to-end approval.

Source links: S120 · Evidence trail → (private workspace)

C141C · P141

CFA defines VPG in terms of minimum sustained write performance for video recording. A card’s peak read figure and a reader’s USB interface label answer different questions.

Claim scope: Public VPG explanation and MRW-G2 interface example; no benchmark or automatic camera qualification.

Source links: S441 · S438 · Evidence trail → (private workspace)

C141D · P141

CFA warns that VPG Profile 5 is not backward compatible with Profile 4: VPG800 or VPG1600 alone does not establish a mode requiring VPG200 or VPG400. Higher-class substitution is described within a profile, and dual-profile certification is a separate condition.

Claim scope: Public FAQ on VPG-5 versus VPG-4 and dual-profile labeling; no individual card certified by this reference.

Source links: S441 · Evidence trail → (private workspace)

C141E · P141

CFA maintains a certified-card register because a displayed VPG logo may be misused. Check the exact card’s certification and the camera mode rather than treating an unfamiliar label or larger number as approval.

Claim scope: VPG-Certified Media Cards section; no named-card database lookup or counterfeit identification performed.

Source links: S441 · 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.