Other types of memory cards
P2 Card (Professional Plug-In) is memory storage media format introduced by Panasonic in 2004. The P2 card is a RAID of Secure Digital (SD) memory cards with an LSI controller tightly packaged in a die-cast PC Card (formerly PCMCIA) enclosure, so data transfer rate increases as memory capacity increases. The cards can also be used directly where a PC card (PCMCIA) slot is available, as in most older notebook computers, as a normal hard disk drive, although a custom software driver must first be loaded. P2 cards are available in capacities of 4, 8, 16, 32 and 64 GB. At introduction, P2 cards offered low recording capacity compared to competing, video tape-based formats (a miniDV tape holds roughly 13 GB of data, and an S-size HDCAM tape holds 50 GB).
SxS (S-by-S) is a flash memory card compliant to the Sony and Sandisk-created ExpressCard standard. According to Sandisk and Sony, the cards have transfer rates of 800 Mbit/s and burst transfer rate of up to 2.5 Gbit/s. Sony uses these cards as the storage medium for their XDCAM EX line of professional video cameras. The card can be inserted directly into an ExpressCard slot, available on many notebooks. However, it will only work in Windows and Mac OS X, and only with a Sony device driver installed on the machine. The card cannot be used directly on any Unix/Linux or other operating system, for which Sony does not publish drivers.
Universal Flash storage
Universal Flash Storage (UFS) is a proposed common flash storage device which is used for digital cameras, mobile phones and consumer electronic devices. Universal flash media could bring higher data transfer speed and increased reliability in flash memory storage, thus reducing market confusion and the varying number of adapters for different number of cards.
Intelligent Stick also known as I-Stick is USB flash drive memory card which was developed by the Power Quotient International (PQI) company in 2002. A significant drawback is that the very small size makes it very easy to misplace. A holder is offered to make it the size of a standard USB flash drive.
NT Card is a memory card which is developed by C-Map company for their line of electronic nautical charts. It is a unique package -- measuring 24 x 34 x 2.5mm -- which may be inserted lengthwise or by one end, as two interchangeable sets of brass contacts are present.Various capacities are available. The other proprietary names for these cards are NT+, and NT-Max which refer to the type of charting that may be programmed on to the memory cartridges themselves.
XQD card is introduced by Sony, San disk and Nikon in November 2010. XQD card is a memory card format primarily developed for flash memory cards. The new format is targeted at high-definition camcorders and high-resolution digital photo cameras. It would offer target read and write speeds from 1 Gbit/s (125 Mbyte/s) to about 500 Mbytes/s and storage capabilities beyond 2 TB.