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Definition: microSD

The smallest SD flash memory card. Introduced in 2005 and widely used in smartphones, tablets, and other handheld devices, microSD is electrically and software compatible with the full-size SD card. Subsequent versions, including SDHC (High Capacity) and SDXC (Extended Capacity), greatly increased storage.

By 2018, 512GB SDXC cards were in production. In the past, SanDisk referred to microSD as TransFlash (T-Flash). See SD card and gruvi card.

The Smartphone Slot
The microSD format is widely used in smartphones and tablets. To gain access to the microSD slot in this Android phone, the back of the case is removed.

Adapters Make microSD Universal
This adapter allows a microSD card to plug into a full-size SD slot. Adapters for miniSD and USB are also available. The half-gram microSD is .59 x .43 inches (15 x 11mm).

A Tad Smaller
Remember floppy disks? It would take 21,000 of them to hold as much storage as this 32GB microSD card, which costs about the same as 10 floppies did. See floppy disk.

Hard to Believe
In 2018, this 512GB microSD card held approximately 800 times as much data as a 17-pound hard drive in the early 1990s. See hard disk.