Introduction of mainstream mobile phone memory card types
SD card is a memory card based on semiconductor flash memory. The standard volume is 24 mm× 32 mm× 2. 1 mm, and the weight is only 2 grams. SD card has the advantages of large capacity, high data transmission speed and strong security (anti-write lock function). SD card is widely used and has now become the memory card with the highest market share.
As the name implies, miniSD card is a small memory card that is "slimmed down" on the basis of SD card. MiniSD card can be converted into SD card through special adapter. It should be pointed out that the miniSD card does not have the anti-write lock function like the SD card. MiniSD card is mainly used for windows mobile and S60 third edition smartphones.
MMC card is an old memory card and can be compatible with SD card devices. For most mobile phones with SD cards, MMC can be used normally. The overall size is about 32 mm× 24 mm× 1.4 mm, which is the same as that of ordinary stamps. The weight does not exceed 2 grams, and the portability is strong. The working voltage of MMC card is divided into 1.8 volts and 3.6 volts, which should be paid attention to when purchasing. The transmission speed of MMC card is relatively slow, and MMC card is rarely used in new mobile phones.
MicroSD card
MicroSD card, also known as TF card, is also a new memory card improved from SD card. Only a quarter of the size of the SD card, it is the smallest memory card at present. Due to its small size, the maximum capacity of microSD card is limited. Some memory cards have reached the capacity of 8GB, while the microSD card with the largest capacity on the market is only 2GB. In addition, the microSD card has a built-in copyright protection management system, which can effectively curb malicious resources.
Remote multimedia card
RS-MMC card, also called MMCmobile card, is a small MMC card developed for mobile phones. RS-MMC card supports dual-voltage operation and has better compatibility than MMC card. It is superior to MMC card in transmission speed and stability, and is mainly used for Nokia's S60 second edition smartphone.
MS card
MS card, commonly known as memory stick, is a memory card developed by Sony. Divided into long sticks and short sticks, short sticks can be transformed into long sticks with adapters. At present, MS cards used in mobile phones are all short sticks, which are special for Sony Ericsson mobile phones. MS card has fast reading and writing speed, high reliability and dustproof.
Miniature memory stick
M2 card is an improved version of MS card, which is smaller and more suitable as a new generation of mobile phone memory card. The size of M2 card is only a quarter of that of MS card, which improves the security and transmission speed, and supports dual-voltage operation, with lower power consumption than MS card.
Purchase suggestion:
First, confirm what type of memory card to buy. What kind of memory cards are supported will be indicated in the mobile phone manual. Please read the memory cards before buying them. If your mobile phone supports more than two kinds of memory cards, you should choose the fastest and most stable memory card. Take Motorola E680i as an example. Although SD card and MMC card are supported at the same time, considering that SD card is superior to MMC card in transmission speed and stability, it should be purchased. In addition, if your mobile phone has requirements for the working voltage of the memory card, you should look at the relevant labels on the memory card package when choosing the memory card to avoid buying a memory card that is incompatible with the mobile phone.
Secondly, try to choose memory cards of famous brands. The demand for memory cards is strong, which leads to a large number of inferior memory cards with inferior brands entering the market. Although this kind of inferior memory card is cheap, its work is unstable, its service life is short, and it may even seriously damage the mobile phone. When choosing a memory card, netizens must choose a memory card of a well-known brand (SanDisk/Sony /Kingmax, etc.). ), and don't buy inferior memory cards with inferior brands for cheap prices.
Once again, keep your eyes open and refuse fakes. At present, there are many counterfeit memory cards on the market. This kind of memory card looks like a famous brand, but it is actually an inferior product produced by some small workshops. So how to identify counterfeit memory cards? There are three main points. First, pay attention to packaging and workmanship. The packaging and workmanship of counterfeit memory cards are relatively rough, which is obviously not as good as genuine memory cards. The second is to pay attention to anti-counterfeiting labels. Memory cards of well-known brands are generally printed with anti-counterfeiting labels with authentication phone numbers and identification codes. You can call the authentication phone number to verify the authenticity. The third is to look at the price. The price of counterfeit memory cards is generally more than half cheaper than the genuine ones. Netizens can look at the relevant market information first to prevent buying fake memory cards.