Crucial's miniSD cards are solid-state devices designed with flash technology, a non-volatile storage solution that does not lose its information when power is removed from the card. The cards contain no moving parts and are extremely rugged, providing much greater data protection than conventional magnetic disk drives.

Like regular SD cards, the miniSD card's nimble, portable data transfer makes it ideal for portable electronic devices. The miniSD's smaller size (it is about 40 percent of the size of a regular SD card) is designed for use in newer mobile phones, which have memory-hungry features such as built-in digital cameras, music download capability, and games.

However, the card uses an adapter that converts the miniSD card into a regular-sized SD card so that the card can be used with other SD-compatible devices, such as digital cameras, MP3 players, and handheld computers. The adapter is also great for using your miniSD card in card readers that accept SD cards but not miniSD cards.

Crucial miniSD cards measure 0.8465 inches wide, 0.7874 inches high, and 0.05512 inches thick (21.5 mm by 20 mm by 1.4 mm).