SD card

    Secure Digital (SD) is a non-volatile memory card format developed by Matsushita, SanDisk, and Toshiba for use in portable devices. Today it is widely used in digital cameras, digital camcorders, handheld computers, PDAs, media players, mobile phones, GPS receivers, and video games. Standard SD card capacities range from 1 MB to 4 GB. The capacity range for high capacity SDHC cards overlaps slightly, beginning at 4 GB but reaching as high as 32 GB as of mid-2009. The SDXC (eXtended Capacity), a new specification announced at the 2009 Consumer Electronics Show, will allow for up to 2 TB capacity cards.

    The format has proven very popular. Changes to the interface of the established format have made some older devices designed for standard SD cards (≤4GB) unable to handle newer formats such as SDHC (≥4GB). All SD-cards have the same physical shape and form factor however, which causes confusion for some consumers.

 SDHC card:

 MicroSD (T-Flash)

    microSD is a format for removable flash memory cards. SD is an acronym for Secure Digital. The cards are commonly used in cellular phones, as well as in handheld GPS devices, portable media players, digital audio players, expandable USB flash memory drives, Nintendo DS flashcards, and digital cameras.

It is the smallest memory card available commercially; at 15 mm × 11 mm × 1 mm (about the size of a fingernail), it is about a quarter the size of an SD card. There are adapters which allow a microSD card to be used in devices intended for SD, miniSD, Memory Stick Duo and even USB cards. However, they are not universally compatible.

 Mini SD card

    The miniSD card was developed to meet industry demands for downsizing mobile phones. It is only 37% the volume of an SD Memory Card. Despite its tiny size, the miniSD card offers all the benefits of the original SD Memory Card, including copyright protection. By inserting the miniSD card into the miniSD adapter, you can share a variety of digital data among standard SD-enabled products.

 MMC mobile card

    New DVRS-MMC (Reduced Size MultiMediaCard) has the same width but almost half the length of existing MMC cards, RS-DVMMC cards will be 24 x 18 x 1.4 mm. It's clear that this new reduced size format is aimed primarily at the mobile phone / PDA market but it would also offer digital camera manufacturers the opportunity to build even smaller digital cameras. A reduced size card can be used in a full size MultiMediaCard with a simple mechanical expander that will make the card "regain" a full size format.

 MMC plus card:

    The Multi Media Card or MMC is the smallest removable flash memory designed specifically for digital applications, such as MP3 music players, digital video cameras, PDAs, mobile phones, voice recorder and digital still cameras. The Multi Media Card has a wide variety of uses in some of the most exciting products on the market today.

 CF card:

    Compact Flash memory is a small removable memory card standard based on flash memory technology, a non-volatile storage solution that does not require power to retain data indefinitely. CompactFlash cards, or CF cards, measure 42.8mm x 36.4mm x 3.3mm in dimension and have 50-pins for data transfer and connectivity. CF cards are most commonly employed in applications such as digital still cameras, digital movie cameras, PDAs, embedded computers, handheld GPS systems, MP3 players and other portable devices. Available for: 64MB CF Card, 128MB CF Card, 256MB CF Card, 512MB CF Card, 1GB Compact Flash Card, 2GB Compact Flash Card, 4GB Compact Flash Card, 8GB Compact Flash Card