MicroSD From Wikipedia, the free encyclopedia

microSD card next to coins

A microSD is an ultra-small, removable flash memory card format originally based on SanDisk's TransFlash card format. It is primarily used in mobile phones, but because of its size and increasing capacity it's also being used in handheld GPS devices, portable audio players, and expandable USB flash memory drives.

At 15 mm x 11 mm x 1 mm — about the size of a fingernail — it is currently the smallest memory card format commercially available. It is about one-fourth the size of a standard SD card but can be inserted into an adapter which allows the card to be used in devices with an SD card slot.

As of May 2006, microSD cards are commonly available in capacities of 128MB, 256MB, 512MB, 1GB, and 2GB.


The microSD format was originally created by SanDisk. It was originally called T-Flash, and then TransFlash, before being rechristened microSD when adopted by the SD Card Association (SDA). Other flash card formats approved by the SDA include miniSD and SD.

The SDA announced the microSD format at CTIA Wireless 2005 on March 14, 2005, and approval of the final microSD specification was announced on July 13, 2005. At launch, the microSD format was available in capacities of 32, 64, and 128 MB. The 1 GB is now available and the 2 GB will be available later in 2006.

Manufacturer Support

The format is currently supported primarily by mobile phone manufacturers, of which Motorola was the first adopter. Garmin produces a line of GPS receivers that ships with microSD cards for map storage.


All Devices which support SD cards support microSD with the SD card adapter which is often included in the packages which increases the full compatibility list. Sandisk has a list of mobile phones with memory card support which gives the type of the memory card slot, and also lists the still camera support, video capture support and music support.

Sandisk's E200 series MP3 players also support MicroSD card expansion, allowing additional capacity. There is no word on the maximum card size which may be supported in this function.

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