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.
Also calledSDHCSDXCSDUCSD capacity
Capacity family is not the write-speed class.
The useful distinction
Look for the complete SD family label in the host manual and on the card, not just a capacity number.
Standard note · not an individual product specification
The useful distinction
Understand the requirement.
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. [C068A]
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. [C068B]
Bounded facts, visible unknowns
Specifications and limits
SD capacity classes: SD, SDHC, SDXC and SDUC facts and limitations
Record form factor, capacity family, bus interface and recording class. A shopping checklist that omits one of these leaves an important requirement unresolved.
AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.
C068ASource checked · pending review
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.
Locator: Capacity ranges, file-system table and Form Factor Size rows Access: public page. Nominal card envelopes are identification aids, not mechanical tolerances, socket footprints, pad positions or formatting instructions.
Claim scope: Named standard or manufacturer description only; procedural checks are editorial recommendations, not hardware tests.. Next review due 2026-12-30.
C068BSource checked · pending review
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.
Locator: Capacity ranges, file-system table and Form Factor Size rows Access: public page. Nominal card envelopes are identification aids, not mechanical tolerances, socket footprints, pad positions or formatting instructions.
Claim scope: Standard class boundaries, not a device maximum, card availability claim or instruction to format existing data.. Next review due 2027-01-05.
Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.
Assessment 2026-10-22 · earliest scheduled source review 2027-01-05. 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
Trace 2 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.
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.
