Digital cameras change the image signal into a data file and store on magnetic media or optical recording media device. If the digital camera is the host computer, then the memory card is equivalent to a ThinkPad t43 battery computer hard drive. Storage memory can record image files in addition to accidents, you can also record other types of files, and computer connected via USB, it becomes a removable hard disk. Common NIKON EN-EL12 battery storage media market, the CF card, SD card, SM, Memory Stick, and a small hard drive. Maybe you will see there are many memory card reader in the market, such as 4-in-one memory card reader, all-in-one memory card reader and so on.
CF card:
CF card (Compact Flash) in 1994 first introduced by SanDisk. CF card with PCMCIA-ATA functionality and compatible; CF card weighs only 14g, only a matchbook-sized (43mm x 36m x m3.3mm), is a solid product, that is, work without moving parts. CF card uses flash memory (flash) technology, is a stable storage solution, which does not require the battery to maintain stored data. Of the saved data is, CF card than traditional disk drives security and protection are higher; than conventional disk drives and PC card type Ⅲ 5 to 10 times as high reliability, and power consumption is only CF card for small disk drives 5%. CF card use a voltage between 3.3V to 5V operation (including 3.3V or 5V). These conditions make the most excellent digital camera to select the CF card as its storage medium of choice.
CF card as the worldwide storage industry standards to ensure compatibility of CF products, to ensure backward compatibility with CF card; as more and more widely used CF card, CF card of the company to actively promote the technology, to promote a new generation of body small light weight, low-power launch of advanced mobile devices, thus improving efficiency. CFA headquarters in Canada, Palo Alto, whose members have the free CF card, CF and CF trademarks technical details. CFA members include 3COM, Canon, Kodak, HP, Hitachi, IBM, Panasonic, Motorola NTN7143 battery, NEC, SanDisk, Seiko (Epson), and Socket Communications, more than 120. And one of the major digital camera manufacturers produce R & D has set up a special organization, engaged in the development of CF products.
CF card has the following disadvantages:
1, the capacity is limited. While the capacity increase exponentially, but still keep up with the development of digital camera pixels. The current products have more than 5 megapixels is the minimum specifications of the popular high-end products, while the civilian market has reached the mainstream level 3 megapixels. Ordinary civilian JPEG compression format, the capacity can still be, but the professional level of TIFF (RAW) format, or image data does not fit a few.
2, The size is large. And compared to other types of memory card, CF card size slightly too large, which limits the use of CF card size digital camera, it holds many lessons for most of the popular ultra-thin digital camera gave up the CF card, and switch to a more compact size SD card.
3, Performance limitations: CF card is generally 0-40 degrees C operating temperature. So 0 degrees below the environment, basic digital camera can be turned into a “waste.” Even professional machines are not immune. Although the military capacity of the CF card cold -40 degrees Celsius, but when spread, when the price dropped to the point where ordinary people can afford is still unknown.
Currently the world’s largest capacity CF card type has reached 640M. General common market, is 8MB, 16MB, 32MB, 64MB, 128MB, 256MB and other types (128MB or more of the type Ⅱ).
SM card:
SM (Smart Media) card is a Toshiba released in November 1995, the Flash Memory storage card, Samsung in 1996 to buy the production and sale of licenses, the two companies to become major manufacturers of SM cards. Smart Media to promote the industry standard, in April 1996 established the SSFDC Forum (SSFDC the Solid State Floppy Disk Card, Smart Media, when in fact the beginning is called SSFDC, 1996 年 6 was renamed as Smart Media, and a Toshiba R). SSFDC Forum has over 150 members, also including many large companies such as Sony np-bn1 battery, Sharp, JVC, Philips, NEC, SanDisk and other manufacturers. Smart Media card is a common micro storage card on the market, once the MP3 player is very popular.
SM card size is 37mm × 45mm × 0.76mm (Figure 1), due to the SM card does not have the control circuit, and made of plastic (to be divided into many thin slices), so small SM card is very thin, in 2002, before which is widely used in digital products, such as the old Olympus digital camera and Fuji digital cameras and more use of older SM storage card. However, SM card is integrated in the digital control circuit which products (such as digital cameras), which makes digital cameras compatibility susceptible.
The new digital cameras now have not used in the SM memory card products.
SD card (Secure Digital Memory Card) is a flash memory device based on a new generation of semiconductor memory devices. SD card from Japan Panasonic, Toshiba and SanDisk Corporation in the United States in August 1999 jointly developed. Like a postage stamp size SD memory card, weight only 2 grams, but it has high memory capacity, fast data transfer rates, great flexibility and good mobile security.
SD card in 24mm × 32mm × 2.1mm for SanDisk flash memory card combined with volume control and MLC (Multilevel Cell) technology, and Toshiba (Toshiba) 0.16u and 0.13u NAND technology, through the 9-pin interface and a dedicated interface drive is connected, no additional power supply to maintain its information on the memory. And it is the integration of solid media, without any moving parts, so do not worry about the damage to the mechanical motion.
SD card structure can guarantee the security of digital file transfer, but also very easy to reformat, it has a wide range of applications, music, movies, news and other multimedia files can be conveniently saved to SD card. So many digital cameras have begun to support the SD card.
Many companies have developed a memory card SD card, SD card Panasonic is the leading manufacturer, in 2000, the SD card from 8MB to 64MB capacity has been divided into four different levels to meet the needs of different occasions, the data transfer rate 2MB / s. The end of 2001 single-card capacity has reached 512MB, data transfer rate is also raised to 10MB / s. Panasonic plans to launch in 2003 capacity of 1GB, the data transfer rate of 20MB / s high-performance memory cards, is expected to reach capacity by 2005 4GB. It seems another way of SD card storage media in the digital camera is expected to open in another piece of heaven.
Sony has always been a loner character created memory stick was born. The gum-based storage devices can be used with Sony almost all common audio and video products. Memory Stick (Memory Stick) thin, light, and has a full variety of functions. Its high compatibility and unprecedented “common storage media” (Universal Media) concept for future high-tech personal computers, televisions, telephones, digital cameras, camcorders and portable personal audio-visual equipment to provide a new generation of faster, larger capacity digital information storage, exchange media.
In addition to small form factor, with high stability and copyright protection, and easy to use in a variety of Memory Stick products and other characteristics, Memory Stick Sony’s advantage lies in the extensive use of the technology products, such as DV camcorders, digital cameras, VAIO personal computers, color printers, Walkman, IC recorders, LCD TV, the PC card adapter, 3.5-inch floppy disk converters, export converters in parallel and USB reader memory Stick and other line of accessories enables easy integration with PC and Mac connection.
Memory Stick launch, Samsung, Aiwa, Sanyo, Casio, Fujitsu, Olympus, Sharp, and a series of companies have expressed support for this format. Sony’s consumer electronics industry is also being sought and the IT industry on the Memory Stick format recognition. Sony will put more in the future on behalf of Memory Stick products introduced to the latest developments in the domestic market.
One disadvantage of Memory Stick can only be used in Sony digital cameras, and second, the capacity is still not big enough.