{
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-20",
  "slug": "sd-capacity-family",
  "term": "SD capacity family",
  "aliases": [
    "SDHC",
    "SDXC",
    "SDUC",
    "Secure Digital capacity"
  ],
  "definition": "An SD capacity family specifies a card's standardized capacity range and associated file-system format, independently of its bus and performance class.",
  "note": "SD covers up to 2 GB with FAT12/FAT16; SDHC covers more than 2 GB through 32 GB with FAT32; SDXC covers more than 32 GB through 2 TB with exFAT; SDUC covers more than 2 TB through 128 TB with exFAT [capacity]. These are specification ranges, not a claim that every capacity is commercially available.\n\nCapacity-family support must be checked separately from connector fit and transfer mode. A microSD form factor, an Express interface and an A2 rating answer different compatibility questions [capacity] [bus].",
  "related": [
    "sd-express",
    "sd-application-performance-class",
    "sd-speed-class",
    "exfat"
  ],
  "citations": [
    {
      "id": "capacity",
      "title": "SD Association: capacity families and file systems",
      "url": "https://www.sdcard.org/developers/sd-standard-overview/capacity-sd-sdhc-sdxc-sduc/",
      "accessed": "2026-10-20"
    },
    {
      "id": "bus",
      "title": "SD Association: bus modes and interface ceilings",
      "url": "https://www.sdcard.org/developers/sd-standard-overview/bus-speed-default-speed-high-speed-uhs-sd-express/",
      "accessed": "2026-10-20"
    }
  ]
}