Introduction to common memory card types: [Edit this paragraph] CF card (compact? Flash)
CF card is one of the memory cards with a long history in the market at present. Its advantages are large storage capacity, low cost and good compatibility, but its disadvantages are large size. It was first launched in 1994 by 5C alliance such as SanDisk, Hitachi, Toshiba, Ingentix and Panasonic. Already has many OEM users and partners such as Canon, LG, Epson, Casio, Minolta, Nikon, Kodak, NEC, Polaroid, Panasonic, Psion, HP, etc. , its manufacturer base is very solid.
CF card consists of control chip and memory module, and the interface is designed as 50 pins. It can be divided into CFⅰ and CFⅱ, and the thickness of the latter is twice that of the former. Digital cameras that only support CFⅰ card do not support CFⅱ card, while cameras that support CFⅱ card can use backward compatible CFⅰ. ? Canon and Nikon's digital cameras are staunch supporters of CF memory cards, while almost all digital SLR cameras use CF cards as storage media.
Although CF has existed for a long time, it still exudes vitality. Many large-capacity and small-volume CF memory cards have been continuously introduced, including IBM and Hitachi's micro-hard disk series (MD), all of which adopt CF II card design. The biggest difference between MD card and CF card is that it uses micro hard disk as storage medium instead of memory stick. Compared with CF card, MD is slightly inferior in durability, especially in shock resistance, but MD has the advantages of large capacity and high cost performance.
In addition, Sandisk and other big manufacturers have also developed CF cards with a capacity of up to 6G. These super-large CF cards are fully used in professional digital cameras.
In the CF memory card currently used by digital cameras, the symbol of access speed is ×, where "/kloc-0 /×" =150kb/s, for example, 4x (600kb/s), 8x (1.2mb/s)10x (. Relatively speaking, a faster CF card will improve the shooting effect of a digital camera. However, due to the CCD sensor, components used and technical reasons, even if a faster CF memory card is used, the speed advantage is hard to be reflected. It is suggested that users of high-end digital cameras can consider choosing a high-speed CF memory card to speed up access and ensure the shooting effect.
In CF memory cards, different manufacturers usually adopt some patented technologies to optimize the reading and writing speed of digital cameras and memory cards, such as Lexar's write acceleration technology (WA). By using writing acceleration technology (WA) in digital cameras, digital cameras can have faster transmission speed and reduce redundant instructions. Especially for high-resolution digital cameras, the application in continuous shooting mode can be optimized by shortening the writing speed of shooting high-resolution image files. [Edit this paragraph] MMC card series (multimedia? Card)
1、MMC
Due to the large size of the traditional CF card, Infineon and Sandisk jointly launched a brand-new memory card product multimedia? Card (MMC card for short). The size of MMC card is 32mm×24mm× 1.4mm, with 7-pin interface and no read-write protection switch. Mainly used in digital cameras, mobile phones (such as Siemens MP3, mobile phone 6688), and some PDA products.
2、RS-MMC
It is a memory card specially designed for mobile phones and other multimedia products launched by MMC Association in 2002. RS-MMC is much smaller than MMC and can be converted into a standard MMC card through a special adapter.
3、MMC？ add
In September 2004, MMC Association launched MMC? PLUS and MMC? Mobile phone. MMC? PLUS card has the same size as ordinary MMC card, and its reading speed is faster. At present, some factories and businesses have also introduced low-voltage MMC? Add.
4、MMC？ mobile phone
In order to obtain better power saving performance, MMC Association has introduced a memory card-MMC, which can work at low voltage and is compatible with the original RS-MMC. Moboile can work in two modes: 1.65 ~ 19.5V and 2.7~3.6V, and its theoretical transmission speed is as high as 52MB/s ... It is called dual-voltage RS-MMC. MMC？ Moboile and RS-MMC cards are the same size, but the biggest difference is MMC? Moboile has 13 gold finger.
5、MMC？ Microscopic, domain-specific
Compared with microSD card, MMC? Micro has a slightly larger volume, which is12mm×14mm×1.1mm ... with MMC? Moboil also supports dual voltages, which is suitable for hand-held portable devices with high requirements on size and battery life, such as mobile phones. [Edit this paragraph] SD card series? (safe? Numbers)
1, SD card
Is it safe? Digital card is referred to as SD card for short. Literally, this card is a security card, which is better than CF card and early SM card in security performance. It is a brand-new memory card product jointly developed by Panasonic, Toshiba and Sandisk. Its biggest feature is to ensure the security and confidentiality of data through encryption function. SD card can be regarded as an upgrade of MMC in many ways. Both of them have the same appearance and working mode, but the thickness of MMC card is slightly thinner, but all machines using SD card devices can use MMC card. Its overall dimension is 32 mm× 24 mm× 2.1mm.
2、miniSD
SD card is slightly bloated for small digital products such as mobile phones. At the same time, in order to catch up with Duo and Xd, the SD card camp released a smaller memory card called "miniSD". Its overall dimensions are 20 mm× 21.5 mm×1.4 mm, its package area is 44% of the original SD card, its volume is 63% of the original SD card, and it has 1 1 gold fingers (there are only 9 SD cards). It can also be used as an SD card through an adapter card. This card is widely used in dopod, Panasonic and other mobile phones. ?
3、microSD
The microSD card standard was formulated by SD Association in 2005 with reference to the relevant standards of T-Flash. T-Flash card and? MicroSD cards are compatible with each other. Compared with the miniSD card, the microSD card is smaller, with the size of11mm×15 mm×1.4 mm, which is only about a quarter of the standard SD card, and it is the smallest memory card on the market at present.
4.T-Flash card, full name: TransFLash, jointly developed by Motorola and Sandisk, was launched in 2004. It is an ultra-small card (11*15 *1mm), which is about 1/4 of the SD card, so it can be regarded as the smallest memory card at present. TF card can be used as SD card after SD card converter. Adapters can be used on devices that use SD as storage media. TransFlash is mainly developed for camera phones, which are used to shoot large images and download large video clips. TransFlash card can be used to store personal data, such as digital photos, MP3 players, games, mobile phone applications and personal data. , and also built-in copyright protection management system to protect downloaded music, videos and games. In the future, the new TransFlash will also be equipped with encryption function to protect personal data, financial records and medical care documents. The compact TransFlash allows the manufacturer to adopt this design without worrying about the size of the mobile phone. Another flexible application is that the supplier can replace it according to the different needs of customers at any time before delivery, which is an advantage that embedded flash memory does not have. ?
Detailed description:?
◆ The volume is about half that of a SIM card, and it is equipped with a copyright protection management system, which is suitable for various multimedia applications. ?
◆ With the adapter, it can be used on digital products with SD card slots. ?
◆ Size:11mm *15 mm *1mm. [Edit this paragraph] Memory stick series (memory? Stick)
Memory stick MS is a memory card product introduced by Sony in 1999. It looks like chewing gum, has the same length as ordinary AA batteries and weighs only 4 grams. It adopts 10 pin interface structure and built-in write protection switch. Depending on the color of the shell, the memory stick can also be blue and white. The white memory stick has the copyright protection function of MagicGate and is often used in media players. Because Sony's digital product line is very rich, memory memory? Memory stick is very popular, now memory stick memory? The stick has been widely used in digital cameras, PDA and digital video cameras.
Since other manufacturers have introduced faster and smaller memory cards, Sony has also introduced memory? A stick? Expand and upgrade products, including MS? PRO，MS？ A duo, ma 'am? Dear? A duo? ,? MS？ Miniature, compact? The family of vault and memory stick is really dazzling.
1、MS？ PRO: it's called an enhanced memory stick, and its size is 50×2 1.5×2.8mm, and its maximum transmission speed can reach 160Mbps, and its maximum capacity can reach 32GB. Please note that memory? A stick? Pro has no original memory module for backward compatibility, so be sure to check whether this type of memory module is supported when purchasing the product. This stick has been widely used in Sony digital cameras since 2003.
2、MS？ Duo: It's called pocket memory stick (short stick). Its size is 20× 3/kloc-0 /×1.6mm. Is the volume ratio standard memory? The number of sticks decreased by about 1/3, while the total amount decreased by 1/2, which made MS? Duo, the total amount is only 2g! The maximum writing speed is 14.4Mbps, and the maximum reading speed is 19.6Mbps.
3、MS？ Dear? Is this MS? The new version of Duo, with the size of 20×3 1× 1.6mm, also supports MagicGate copyright protection technology, and the transmission speed is as high as 20 MB/s. At present, short sticks are widely used in Sony digital cameras and Sony Ericsson mobile phones. MS？ Duo can be connected to standard MS products through adapters. Suggest buying MS? PRO memory stick can also consider buying MS? Dear? Duo short stick, so as to be used in more digital products.
4、MS？ Miniature (M2): Introduced in February 2006, this is a very compact memory card, mainly designed for mobile phones. The size is15×12×1.2mm, only MS? Dear? A quarter of the duo. Support 1.8V and 3.3V dual voltages.
5. Compact? Vaulting: Sony and Seagate jointly developed a micro hard disk product compatible with CF Ⅱ memory card standard. At present, the maximum capacity has reached 8GB, which can store 2560 pictures about 3MB or MP4 for 320 minutes. [Edit this paragraph] xD image card (XD? Pictures? Card)
XD image card is a follow-up product of SM card jointly developed by Fuji and Olympus Optical Industry. What is the size of the card? x？ 25.0? x？ 1.7mm in volume and only 3g in weight. It is also one of the smallest and lightest memory cards at present.
After 2003, digital cameras introduced by Fuji and Olympus all use xD memory card as the medium. xD-Picture？ The card is named after the "limit"? The abbreviation of Digital (cutting-edge image storage technology). Its reading speed is as high as 5MB/ s, and its writing speed is as high as? 3MB/ s (specification: above 64MB). Power consumption is only 25mW. [Edit this paragraph ]SM (Smart? Media) card
SM (smart? Media card is Flash 1995+0 1 released by Toshiba in June. Memory card, Samsung purchased the production and sales license at 1996, and these two companies became the main SM card manufacturers. SmartMedia card is also a common micro memory card in the market, which was once very popular on MP3 players.
The size of SM card is 37 mm× 45 mm× 0.76 mm Because SM card itself has no control circuit and is made of plastic (divided into many pieces), SM card is small and very thin, and it was widely used in digital cameras of Olympus and Fuji before 2002. However, because the control circuit of SM card is integrated in digital products (such as digital cameras), it is easy to affect the compatibility of digital cameras.
It is difficult to see its existence in the market at present.