Capacity family and transport technology are different layers.
Standard No drawing: not a physical form
P068 · StandardSD capacity classes: SD, SDHC, SDXC and SDUC≠
Standard No drawing: not a physical form
P069 · StandardUHS-I and UHS-II bus interfaces≠
Standard No drawing: not a physical form
P070 · StandardSD Express interface overview
How they differ
SD capacity classes: SD, SDHC, SDXC and SDUC Look for the complete SD family label in the host manual and on the card, not just a capacity number.
UHS-I and UHS-II bus interfaces Read the bus mark separately from U1, U3 or V-class markings. A similar-looking numeral can refer to a different concept.
SD Express interface overview Find the Express wording and the host implementation requirements, rather than inferring transport from the card outline.
At a glance
Source-scoped form facts; counts, variants and unknowns are distinct
Field
SD capacity classes: SD, SDHC, SDXC and SDUC
UHS-I and UHS-II bus interfaces
SD Express interface overview
Type
Standard
Standard
Standard
Family
Storage
Storage
Storage
Key distinction
Capacity family is not the write-speed class.
A bus ceiling is not a card benchmark.
An SD-shaped slot does not prove ordinary SD or Express support.
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 Standard records. Similar layer does not mean compatible, interchangeable or safe to mate.
Families represented: Storage
The reference ledger
Read the same question across.
3 selected records · 12 fields No score. No compatibility verdict.
Page scope: Evidence behind the compared records; the editorial comparison still needs separate review.
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.
SD Association · Standards-organization domain · inspected 2026-10-07 · due 2027-01-05
Within inspection window
Scoped support: SD capacity/file-system classes and nominal full-size SD and microSD envelopes; not host capacity approval.
Not established / limitations: Nominal card envelopes are identification aids, not mechanical tolerances, socket footprints, pad positions or formatting instructions.
Locator: Capacity ranges, file-system table and Form Factor Size rows
SD Association · Standards-organization domain · inspected 2026-10-07 · due 2027-01-05
Within inspection window
Scoped support: Minimum sequential-performance class symbols and same-family host/card matching under defined conditions.
Not established / limitations: Bus modes and performance classes are distinct. Shared numeric minima across different class symbols do not guarantee the requested host class; no particular video mode is approved.
Locator: Speed-class families and Best Combination between Speed Class Host and Card
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 5 claims to their source records
C068A · P068
The SD Association defines SD up to 2 GB, SDHC above 2 GB through 32 GB, SDXC above 32 GB through 2 TB, and SDUC above 2 TB through 128 TB. These are capacity families, not speed ratings.
Claim scope: Named standard or manufacturer description only; procedural checks are editorial recommendations, not hardware tests.
The SDA capacity classes are SD up to 2 GB, SDHC above 2 GB through 32 GB, SDXC above 32 GB through 2 TB, and SDUC above 2 TB through 128 TB. The standard file-system associations are FAT12/16, FAT32, exFAT and exFAT respectively.
Claim scope: Standard class boundaries, not a device maximum, card availability claim or instruction to format existing data.
The SD Association lists UHS-I SDR104 at 104 MB/s and UHS-II at 156 MB/s full duplex or 312 MB/s half duplex. These bus figures are not guaranteed sustained card-write rates.
Claim scope: Named standard or manufacturer description only; procedural checks are editorial recommendations, not hardware tests.
UHS-I and UHS-II name bus interfaces; U1/U3 and V6/V10/V30/V60/V90 belong to speed-class symbol families. The SDA warns that matching numerical write-speed minima across different symbol families does not establish the host/card class match.
Claim scope: Label interpretation and defined minimum sequential-performance conditions only; not a measured transfer rate, blanket recording-mode recommendation or certification of an individual card.
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.
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.
