microSDHC

microSDHC stands for micro Secure Digital High Capacity. It is a removable memory card format in the Secure Digital (SD) family that provides larger storage than the original microSD cards. MicroSDHC cards conform to the SDHC specification, which defines capacity limits and performance requirements for mobile and embedded devices. They offer storage from 2 GB up to 32 GB.

Capacity and formats: microSDHC cards offer 2 GB to 32 GB of storage. They are typically formatted with the FAT32 file system, though some devices may establish a different format during initial use. This capacity range is distinct from microSD (SDSC), which tops at 2 GB, and from microSDXC, which supports larger capacities.

Physical size and compatibility: The microSDHC card measures 15 mm by 11 mm by 1 mm and fits in microSD slots, often using adapters to fit standard SD slots. Compatibility depends on the host device: devices that support SDHC can usually access microSDHC cards; devices that only support older SDSC cards may not recognize 4–32 GB cards.

Speed and performance: microSDHC cards are rated by speed classes, including Class 2, 4, 6, and 10, which indicate minimum sustained write speeds. Many microSDHC cards also carry UHS speed class ratings (U1, U3) for devices that support UHS-I, which indicate higher performance suitable for high-definition video or fast app loading. Real-world speeds vary by card and host.

Usage and context: MicroSDHC cards are widely used to expand storage in smartphones, tablets, cameras, action cameras, drones, and handheld game consoles. They are generally inexpensive per gigabyte and offer removable, portable storage, though users should choose a card with a suitable speed class for their intended use and ensure device compatibility.