miniSD is a smaller form-factor version of the Secure Digital (SD) flash memory card. It is used with mobile phones, PDAs, MP3 players and other portable hardware devices to provide a storage solution. Through use of an (usually bundled) adapter, miniSD cards can bhe inserted into any standard sized SD slot. SanDisk Corporation announced the miniSD card back in 2003 and since it has been adopted and developed by many manufacturer under a variety of different brand names.
Since miniSD has hit the market, microSD cards have come and largely taken over much of the demand. While miniSD cards are already significantly smaller than SD cards, microSD cards are even smaller again and so are a wise choice over miniSD for smaller mobile phones in particular. The dimensions of a miniSD card are about 21.5mm x 20mm x 1.4mm.
There are a variety of Secure Digital (SD) products available..
Secure Digital (SD) --> Original SD card offering capacities up to 8GB currently.
miniSD --> A smaller form-factor version of the original SD card.
microSD --> Currently the smallest flash memory card on the market.
miniSDHC --> High Capacity version of miniSD card.
microSDHC --> High Capacity version of microSD card.
SD plus --> A form of SD card developed by SanDisk.with USB additions.
Eye-Fi --> An SD card with built in Wifi capabilities of its own.
Gruvi --> A form of SD card developed for content distribution by SanDisk.