Memory card category

Digital cameras and cameras often use the following memory cards: Secure Digital SD card, memory stick for memory stick, compact flash for CF card, smart media card for smcard, and multi memory card for short the mmccard and XD picture card are referred to as the XD card.

The SD card is the secure digital card-secure digital card, which is developed by Panasonic, Toshiba, and SanDisk. It features a large capacity, high performance, and security. It has an additional ID authentication function (sdmi Specification) for data copyright protection than the mmccard ). It is mainly used by manufacturers such as Panasonic digital cameras, cameras, Canon and sharp cameras, Kodak, Minolta, and Casio digital cameras. The size is 32mm × 24mm × 2.1mm, which is much larger than the capacity of the mmccard, and 1 GB has been produced. The read/write speed of this card is 4 times faster than that of the mmccard, up to 2 MB/second. Mmccard compatibility, SD card plug-in mostly support mmccard.

Mmccard is a multimediacard multi-media card. It is a multi-function memory card developed by SanDisk and Siemens in Germany. It has small and lightweight features, the shape is 32mm × 24mm × 1.4mm, the weight is less than 2 grams, and the impact is high. It can be read and written repeatedly for 0.3 million times. The driving voltage is 2.7-3.6 V. Currently, the maximum capacity is MB, which is mostly used for JVC digital cameras.

Memory Stick memory stick is a digital memory card launched by Sony. Memory Stick adopts a single-plane 10-pin independent needle slot design, which is easy to plug and remove from the slot and is not easy to damage. From the perspective of specifications, memory stick has three types: General rod, high-speed rod Memory Stick PRO, and short rod memory stick duo. The general rod and high-speed rod have the same size as 50mm × 21mm × 2.8mm, the difference is that the high-speed rod has added the magicgate Copyright Protection Technology to the memory card, with a higher read/write speed and a higher storage capacity limit. The size of the memory stick is further reduced by about 1/2 of the size of the normal stick. Using an adapter, The Size stick can be used like a normal stick, and the length stick cannot be used on the model of the short stick. The memory stick is mainly used on Sony's digital cameras and cameras. This year, Sony's HC series and T1, T3, T11 and other digital cameras all use short sticks.

The CF card was developed by SanDisk in 1994 and has the advantages of permanent data storage, no power supply, fast speed, and lower price than other types of memory cards. Two common types are available: the size of the CF type I card is 42.6mm × 36.3mm × 3.2mm, while the CF type iicf card itself has memory and controller, the storage capacity can also be increased. Currently, the common capacity of CF type I cards on the market is 32 MB, 64 MB, 128 MB, 512 MB, 1 GB, and GB, the maximum capacity of the Type II card is currently 3 GB. In addition, the maximum capacity of the microdrive of the magnetic media can currently reach 4.2 GB. The CF card is mainly used on digital cameras such as Canon, Kodak, and Nikon.

Xdcard is a small memory card jointly launched by Fuji and Olympus for digital cameras, with a single side 18-pin design, with an external size of only 20mm × 25mm × 1.7mm, is currently the smallest memory card. The theoretical maximum capacity of the xdcard is 8 GB. Currently, the xdcard has 16 MB, 32 MB, 64 MB, 128 MB, MB, and other capacity specifications on the market.

The SMK card is a small memory card launched by Toshiba, Japan. It has 22-pin interface, the size is 45mm × 37mm × 0.9mm, and the weight is about GB. Unlike most digital memory cards, SMSs are made of plastic and the controller is built into a digital camera. Because of the poor compatibility of the camera, SMSs are not widely used by manufacturers, the maximum storage capacity of the product is also very limited, the maximum storage capacity of the smcard is only 128 MB. Olympus's old digital cameras and Fuji's old digital cameras mostly use SM memory cards. The new digital cameras have no products that use SM memory cards.

Commonly used digital cameras are CF cards and SD cards. Memory stick is mainly used in Sony's digital cameras, and xdcards are mainly used in Fuji and Olympus digital cameras. From the actual comparison of read/write performance, the average read performance of memory cards of different specifications is not very significant.