What are the types of memory cards and the difference between various types of multimedia memory cards

Multimedia flash memory card is a general term, including SD, MMC, TF, MicroSD and so on.
At present, the multimedia flash memory cards used in the market are: CF, MMC, SD, MIN-SD, RS-MMC, T-Flash, MS, MS PRO, MS Duo nine
SD Card (Secure Digital Memory Card) is a new generation memory device based on semiconductor flash memory. SD card by Japan's Panasonic, Toshiba and the United States SanDisk company in August 1999 jointly developed, the size of a postage stamp SD memory card, weight only 2 grams, but has a high memory capacity, fast data transfer rate, great mobility flexibility and good security
Detailed description:
Built-in encryption technology, ADAPTS to the work copyright protection function based on SDMI protocol.
High-speed data transfer, averaging 2 megabits per second.
Type: FlashMemory Card (FlashMemory)
· Compatible interface :9 pins
Transmission frequency: Maximum 25MHZ
Transfer speed: 2MB/ SEC when writing, 3MB/ SEC when reading
* Power supply voltage :1.6~37V
Weight dimensions: 24mm (W)x 32mm (H)x21mm (H), 2 grams. sd cards include high-speed sd cards, minisd cards, microsd cards, and sdhc cards of new specifications
Multimedia files such as music, movies, and news can be saved to SD cards, and many digital cameras also support SD cards.
MINISD card
miniSD Card is a smaller Memory card that is more suitable for small mobile phones based on the Flash Memory Card used in digital cameras, PDAs and so on. Although the physical size and interface shape of the minisD card are different from the original SD card, electrical standards such as interfaces are the same to ensure compatibility. Insert the miniSD into the dedicated speaker. You can read and write the miniSD card through the original SD card slot. The miniSD card has 2 more interfaces than the SD card's 9, and 11 signal cables. The additional two signal lines are for future expansion performance. For example, it can be used for short-range wireless communication such as non-contact IC antenna connection. The remaining nine signal cables are of the same standard as the original SD card
A memory card more suitable for small mobile phones
Detailed description:
* The miniSD card can store digital photos, audio, MP3 files and other data files and is designed to meet the needs of today's popular multimedia mobile phones
* More than 60% smaller than SD card.
* Suitable for digital products with SD card slots when paired with an adapter.
* Features: high-speed data read and write, backup, high storage capacity, non-volatile solid state, power down data automatic storage; No rotating parts, extend battery life; User selectable mechanical write protection switch; It can withstand working vibration rate 2000Gs.
Size :21.5mm*20mm*1.4mm
CF card (CompactFlash) was first introduced by SanDisk in 1994. The CF card has the PCMCIA-ATA function and is compatible with it: the CF card weighs only 14g, is only the size of a cardboard match (43mm x 36m x m3.3mm), and is a solid state product, that is, it works without moving parts. Using flash technology, the CF card is a stable storage solution that does not require a battery to maintain the data stored in it. For stored data, CF cards are more secure and protective than traditional disk drives; 5 to 10 times more reliable than traditional disk drives and subtypes of PC cards, while MCF cards use only 5% of the power of small disk drives. CF cards operate with voltages between 3.3V and 5V (including 3.3V or 5V).
Digital cameras choose CF cards as their preferred storage media
Detailed description:
* Features: high speed read and write data, high storage capacity, non-volatile solid state, automatic storage of power failure data, no rotating parts, extend battery life, can withstand the working vibration rate of 2000 Gs.
Weight: Less than 11.4g.
Size: 43mm*36mm*3.3mm.
3. Memory sticks
1. MS
The Memory Stick, developed by Sony Corporation, is 50mm x 21.5mm x 2.8mm and weighs 4 grams. Unlike many Flash Memory cards, the Memory Stick specification is non-public and there is no standardization organization. Using Sony's own form, protocol, physical format, and copyright protection technology, its specifications required a negotiated license with Sony. The Memory Stick, including the controller, uses a 10-pin interface, the data bus is serial, the maximum frequency can reach 20MHz, the voltage is 2.7 volts to 3.6 volts, and the average current is 45mA. In addition to its small size, high stability and copyright protection functions, and easy use in a variety of memory stick series products, the advantage of memory sticks is that SONY has launched a large number of products that make use of this technology, such as DV cameras, digital cameras, VAIO computers, color printers, Walkman, IC recorders, LCD TVS, etc. Full-line accessories such as PC card converter, 3.5-inch floppy disk converter, parallel outlet converter and USB reader make it easy to connect memory sticks to PCS and Macs
High storage capacity. The theoretical maximum capacity of the memory stick is 32GB. The current maximum capacity is 2G.
* High speed data transfer. It can achieve a transfer speed of up to 160mb/s, which is equivalent to 8 times that of ordinary memory sticks, enabling high-speed transmission of large-capacity data, including high-precision digital photos and various files
* Security. With MagicGate copyright protection technology, it provides a secure environment for downloading and playing copyrighted content, providing the possibility of protecting personal data and top secret information.
2. MS PRO
Full name: Memory Stick
PRO(Enhanced memory stick, memory stick PRO), this new memory stick shape and volume is the same as the ordinary memory stick, but the performance and capacity have been improved to the maximum capacity of 32GB on the original enhanced memory stick design, and the read and write speed has been improved several times. MS Duo
Full name: Memory Stick Duo, that is, micro memory stick, the size and weight of the micro memory stick are about one-third of the ordinary memory stick.
Four, TF card
T-Flash card SanDisk announced on October 26, 2004 the launch of the 256MB TransFlash, TransFlash is currently the world's smallest flash card, about a quarter of the size of an SD card 15x 11 x 1mm, the same size as a fingernail. The adapter can be used on devices that use SD as the storage medium. TransFlash was developed primarily for camera phones to capture large images and to be able to download larger video clips. TransFlash card can be used to store everyone's data, such as teaching word photos, MP3, games and applications for mobile phones and personal data, but also set up a copyright protection management system, so that downloaded music, images and games are protected, the future launch of the new TransFlash also has encryption function, Protect everyone's data, financial records and health and medical documents. The compact size of TransFlah allows manufacturers to adopt this design without having to worry about the size of the phone, and another flexible application is that suppliers can replace it at any time according to different needs of customers before delivery, which is not an advantage of embedded flash memory.
Detailed description:
The volume is about half of a SIM card, and the copyright protection management system is built in, which is suitable for many multimedia applications.· With an adapter, it can be used in digital products with an SD card slot
Size: 11mm*15mm*1mm.
MMC card MMC(MuliMediaCard, multimedia memory card) was initiated by SanDisk and Siemens in 1997, compared with the traditional mobile memory card, its most obvious external feature is the size is more miniature only ordinary postage stamp size is about 1/5 of the CF card size), The overall dimensions are only 32mmx24mmx1.4mm, and its weight does not exceed 29. This makes it the smallest semiconductor mobile memory card in the world, and it forms a strong support for all kinds of handheld devices that are increasingly pursuing portability. MMC was designed at the beginning to target the mobile phone and pager market, and then was quickly introduced to more applications due to its unique advantages such as small size. Such as digital camera PDA, MP3 player, laptop computer, portable game console, digital video camera and even handheld GPS.
In addition, due to the lower operating voltage, the drive voltage is 2.7-3.6V. MMC is more power efficient than the previous generation products such as CF and SM, and the current common capacity is 64MB/128MB, ATP Electrionics has taken the lead in introducing 1GB high-capacity MMC cards with the development of MMC cards, there are more technical RS-MMC and MMC Micro cards.
RS-MMC Reduced Size MMC), each piece of RS-MMC contains a mechanical extender, which can convert RS-MMC to standard MMC, suitable
For all devices compatible with MMC or SD card RS-MMC Features: high storage capacity, non-volatile solid state, automatic storage of power failure data: no moving parts, extended battery life: can withstand working vibration rate of 2000 G, The equivalent of being 10 feet tall on the floor: music players, digital video cameras, mobile phones and all the other devices that feature MMC slots.
MMC micro memory card is still a relatively unfamiliar term for most users, its standard is formulated by Samsung, and it is mainly used for Samsung specific models, so domestic users have not a lot of opportunities to access this memory card. The actual size is about a third of the volume of the RS-MMC. It supports two operating voltages of 1.8V/3.3V, and its pin is 10pin. The product itself has a strong audio and video function and low power consumption, very suitable for mobile phones, MP3, PDA and other small digital equipment.