The higher-end professional cameras may have microdrives; these are hard drives that are built in the form of a compact flash. With the use of an adapter, you can use SD cards in a compact flash device. Digital cameras may use a memory card or a flash memory card, which are solid-state electronic storage devices.
In October 1998, Sony introduced the removable flash memory card called the Memory Stick; this term is used to describe the entire family of memory sticks. While the original stored up to 128 MB of data, an 8 GB card is now available that holds two 128 MB banks. There is also a card specifically designed for high-definition stills and video cameras called the Memory Stick Pro-HG.
This form of storage has outlived all other types of digital storage devices, and it isn't known if this is due to the manufacturers continued support of the device, or because of the technology it contains as a storage format.
Gradually taking the place of the memory stick is the flash memory card SD/MMC. Originally they were limited to 2 GB of storage, but are now being replaced with 4 GB cards. A revision was made to the SD standard, which means that all cameras don't recognize the larger storage capacity of the 4 GB cards.
In addition, these cards are formatted in the FAT32 file format, and the older digital cameras use FAT16 format, which contains a 2 GB limit. Camera phones use a MiniSD Card, which is about half the size of the standard memory cards used by digital cameras.
Also available in camera phones is the MicroSD Card, which is about ¼ the size of those in digital cameras. An even smaller format was the XD-Picture Card developed in 2002. Smart Media, containing 128 MB of memory, at one time competed with the Compact Flash; it is now obsolete and was replaced by the xD picture card.
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