Mobile phones themselves have a certain memory capacity, in order to meet people's personalized needs for cell phone memory, many modern cell phone brands and models are set up with an external memory, which is what we usually call cell phone memory card. Cell phone memory cards can be used to store songs, movies, e-books, game software and other data information. The common memory cards on the market now are divided into MMC, SD, MiniSD, Memory Stick, SM and so on.
MMC
The MMC (MultiMedia Card) card was launched in 1997 by Siemens and SanDisk, which was the first to launch CF. In January 1998, fourteen companies jointly established the MMC Association (MultiMedia Card Association or MMCA), which now has more than 84 members. MMC's development goal is mainly for digital imaging, music, cell phones, PDAs, e-books, toys and other products, claiming to be the world's smallest Flash Memory memory card, with a size of only 32mm x 24mm x 1.4mm. Although it is thicker than SmartMedia, the overall volume is smaller than SmartMedia and lighter than SmartMedia, with a size of only 32mm x 24mm x 1.4mm. Although thicker than SmartMedia, the overall size is smaller than SmartMedia, and lighter than SmartMedia at 1.5 grams, MMC also puts the storage unit and controller together on the card, and the smart controller makes MMC ensure compatibility and flexibility.
The MMC memory card can be categorized into two modes of operation, MMC and SPI. MMC mode is the standard default mode and has all the features of MMC. SPI mode is the second mode available for MMC memory cards. This mode is a subset of the MMC protocol, and is mainly used in systems that require only a small number of cards (usually one) and low data rates (compared to the MMC protocol).
MMC is designed as a low-cost data platform and communication medium. and communication medium with a very simple interface design: only 7 pins! The interface costs less than $0.50, compared to SmartMedia and Memory Stick, which both cost more than $1. In the interface, the power supply is 3-pin, while the data operation can be done with just a 3-pin serial bus (SPI mode adds another 1-pin for chip selection).
The MMC operates from 2.7 volts to 3.6 volts and has low power consumption with write/read currents of only 27mA and 23mA. Its read/write modes include streaming, multi-block and single block. The minimum data transfer is in blocks, and the default block size is 512 bytes.
SD
Super Dollfie abbreviated as SD,
is a 1/3 ball-shaped articulated action figure manufactured by the Japanese company volks,
developed and shaped by Master Akihiro Yuanjue.
The common SD is 58cm tall,
and there is also a 13 year old SD that is 60cm tall, and a mini SD that is 43cm tall.
The price is different, and it is usually around CNY4500-8500,
and the mini SD is usually around 2,000-4,000 yuan.
Specialty SD is a 1/3 ball articulated action figure made by Japanese company volks.
The special feature of SD is that it can be modified by the players themselves,
Because the eyes, hair, body joints, hands, feet, arms and legs of SD can be separated,
Players who can't assemble can buy the combination of completed SD,
It is precisely because of the flexibility of these joints,
That's why the SD dolls that we have seen can be posed with so many poses,
We can see that SD dolls can be posed with so many poses,
We can also see that SD dolls can be posed with a lot of different colors and colors. so many Poses,
or dashing or elegant, lifelike to perform a scene in front of the camera.
And then there's the ability to apply makeup to the SD's face,
whether it's eyebrows, eyelashes, eyeliner, lip gloss, or even rouge on the face,
allowing players to dress up their SD as a beautiful woman or a handsome man,
and to create a SD that is uniquely their own.
These are all part of what makes SD so unique and so special, and they can be used in many different ways. can be loved even more because of its different hair color, hairstyle, eye color, gorgeous costumes and different outfits,
which can show a variety of styles.
Because the threshold is so high, SD is dominated by Generation X players who have not yet lost their childlike spirit, but have begun to earn an income. IMAI, who runs her own doll studio, has six SDs in total***, and says her family is aware of her hobby and has now 'given up on her'.
There are dozens of people playing with SD dolls in Taipei's "doll circle" from all walks of life, and there is even a young female dentist, "Huo Huo", who not only utilizes the dentist's skills to fix the doll's face, but also takes the SDs out of the country to take location photos of the SDs in the lakes and mountains of Switzerland.
In addition to this young group on the "stage", "Mrs. Noble" is also a super large SD, Momoko and Jenny dolls, often a hand of 50,000, 100,000, to buy clothes without hesitation, but due to the status of the status of the players never contact with the general public.
The SD dolls are very delicate, so they also attract a lot of male players. Engaged in art design "bear" and sister "bear sister" from last year to join, has six SD, the investment amount of more than 200,000, bear said: "do not dare to think of how much money spent, it is too terrible.
In addition, the players will also exchange "motherhood" and "maintenance", "I use moisturizing essence to help her wash her hair, so that it will not be frizzy!
In addition, players will also exchange "mom tips" and "care tips", such as "I always wash her hair with moisturizer so it doesn't get frizzy!
The popular dolls on the market today are mostly based on "one-sixth" and "one-third", with the former about 30 centimeters tall, and there are Jenny, Lika, Momoko and G.I. Joe dolls for girls and G.I. Joe dolls for boys, and the latter about 60 centimeters tall, and only SD is more popular now.
SD dolls come in different heights, with the regular SD at 58cm and the miniSD at 43cm, and the newest SD dolls coming out at 43cm. The newest SD13 (13 refers to a girl who looks like she is 13 years old) is 60cm. these SD's have movable joints, can change their hair, can change their eye color, and you can help them change their makeup and face shape.
On the Internet, SD is often used as a curse word, and is the first letter of the Chinese character for "stupid dick".
And explain me <yes>
SD also has the meaning of Shanghai Shanda Networks' pronoun
In the electronics industry
SD card is SecureDigitalCard - Secure Digital Card, which was developed and developed by Matsushita, Toshiba, and the U.S. SANDISK Corporation. *** developed by Panasonic, Toshiba and SANDISK, it is a multifunctional memory card with various features such as high capacity, high performance and security. It is more than the MMC card with a password authentication function for data copyright protection (SDMI specification). It is mainly used for Panasonic digital camcorders and cameras, Canon and Sharp camcorders, Kodak, Minolta, Casio digital cameras and other manufacturers. Size 32mm x 24mm x 2.1mm, slightly thicker than the MMC card capacity is much larger, has produced 1G capacity. The read and write speed of this card is 4 times faster than MMC card, up to 2MB/sec. It is also compatible with MMC cards, and most of the sockets for SD cards support MMC cards.
After that, there are RS-SD (Reduce size SD) mini-SD and so on
Mini SD card: full name (Mini Secure Digital Memory Card). miniSD card is the development of SD card, the performance and the traditional SD card and there is no big difference between the miniSD card and SD card. The performance of miniSD card is not much different from traditional SD card, miniSD card and SD card have the same data transfer speed of 2MB per second. Like traditional SD card, miniSD card also has hardware data write protection switch, which can avoid the risk of accidental deletion of the stored content. miniSD card is characterized by small size (volume of only 21.5 x 20 x 1.4mm, compared with the original SD card reduces the volume of 40%), stable performance, can be used with a special adapter card, fully compatible with the standard SD card slot. Moreover, miniSD card adopts the design of low power consumption, which is more suitable for mobile communication devices than SD card, so it mainly attacks the information terminal of cell phone, PDA and PDA.
Today Panasonic has launched a single-load 4GB SD card.
miniSD
The mini-SD card is a smaller and more suitable memory card for small cell phones, based on the Flash Memory Card used in digital cameras and PDAs. Although the mini-SD card has a different form factor and connector shape than the original SD card, the electrical standards, such as the interface, are the same to ensure compatibility. By inserting the mini-SD card into the dedicated adapter, the mini-SD card can be read and written through the original SD card slot. However, there is no write-proof locking feature like SD cards.
The mini-SD card has 2 more interfaces than the 9 of the SD card, with 11 signal lines (Figure 4). mini-SD card's 2 extra signal lines are for future extended performance. For example, it can be used for antenna connection for close-range wireless communication such as contactless IC, etc. The remaining 9 signal lines of the mini-SD card are the same standard signal lines as the original SD card. Mini-SD cards, on the other hand, are small SD cards developed specifically for digital devices such as cell phones, and are more compact than SD cards. Panasonic is the industry standard driver and major product provider in the SD card and Mini-SD card space.Memory Stick
SONY's Memory Stick (or MS Card for short)
Since SONY announced the development of the Memory Stick in July 1997, the Memory Stick has been fully utilized across the full range of Sony's products, with capacities ranging from 4M to 128M. Products can be in SONY's own products to get different applications, digital devices, the most extensive product line of SONY and even strive to make this Flash Memory become the industry standard. SONY itself said that its Chinese name is Memory Stick, in fact, it is the size of 50mm x 21.5mm x 0.28mm, weight 4 grams. The connector is a single flat 10-pin connector with a separate pin slot and a write-protect switch. Amidst the increasing emphasis on the need for copyright protection, in December 1999 Sony introduced the new MagicGate Memory Stick, the main change being the incorporation of Sony's patented copyright protection technology called MagicGate, which complies with the SDMI standard.
Sony's Memory Stick cards are subdivided into three sizes, Memory Stick, Memory Stick PRO, and Memory Stick DUO, depending on the form factor, with Memory Stick capacities currently ranging from 16MB to 128MB, and Memory Stick Pro has a capacity between 256MB-1GB and can reach 32GB in the future, and Memory Stick DUO has the smallest capacity between 16MB-32MB, and can be inserted in the card slot like the original MS card through an adapter.
The MS PRO belongs to the higher end of the MS family, and although it has the same shape as an MS card, it has improved transfer speeds, with a minimum recording speed of 15 Mbps. it can be adapted to record continuous motion graphics.
3. a smart memory card, a modern technology term
that is, Smart Media, smart media card, a storage medium. SM card uses SSFDG/Flash memory card, with ultra-small, ultra-thin, ultra-light and other characteristics, the volume of 37 (length) × 45 (width) × 0.76 (thickness) mm, the weight is 1.8 g, low power consumption, easy to upgrade. The SM converter card also has a PCMCIA interface for easy data transfer.
SM card is a small memory card introduced by Toshiba of Japan, has a 22-pin interface, measures 45mm x 37mm x 0.9mm, and weighs about 1.8g. Unlike most digital memory cards, SM cards are made of plastic, the controller is built into the digital camera, due to the camera's compatibility is not strong, so it has not been widely promoted by manufacturers, the maximum capacity of the product is also very limited, the SM card's maximum storage capacity is only 128MB. Olympus's old digital cameras and Fuji's old digital cameras are mostly used in the SM memory card, the new launched digital cameras are no longer used in the SM memory card. The old Olympus and Fuji digital cameras used SM memory cards, and the newer ones don't use SM memory cards anymore.