SD Standards Family

The success and pervasiveness of SD standards has given rise to countless devices, applications and services. The SD Association provides a convenient classification system below to communicate usage and features for SD standard type and size for host devices.

Note that the universally known and used SD memory cards are classified as removable nonvolatile memory and feature four capacities: SD, SDHC, SDXC and SDUC. The removable nonvolatile memory classification also includes a category for optional content security features, which enable SD memory cards to be used as storage for content-protected audio, video and books.