At first glance, the memory card seems to have little to do with the mobile phone, but it is an indispensable part of smart phones and multimedia phones, just like the PC's dependence on the hard disk. Therefore, how to choose a memory card for mobile phones has become a topic of concern to us.
Before choosing a memory card, let's look at the classification of mobile phone memory cards. There are generally six kinds of memory cards for mobile phones.
MMC card
The full name of MMC is multimedia card, which is an early small memory card. Because the SD card specification formulated later retains the compatibility with MMC cards, it can also be used on SD devices.
Sd card
The full name of SD card is secure digital memory card, which is a kind of memory card jointly developed by Panasonic of Japan, Toshiba and SanDisk of the United States.
RS-MMC
The reduced size MMC, that is, the reduced size MMC card, is exactly the same as the standard MMC except for the reduced size. Through the small iron piece presented with the card, it can reach the standard size of MMC card and be compatible with traditional MMC and SD equipment.
Mini SD
As the name implies, it is a mini SD card. Like RS-MMC, Mini SD only reduces its size, and is no different from the traditional SD card in other aspects. It is fully compatible with SDD devices through a special MiniSD-SD adapter.
TF card
TF card (full name TransTlash) is the world's smallest flash memory card developed by SanDisk Company, a world-famous storage equipment manufacturer. Its size is15x11x1mm, which is about 1/4 of SD card and about the size of a nail.
At present, the mini SD card is becoming a trend and is adopted by more and more mobile phone manufacturers, such as BenQ Rubik's Cube, Dopod 585, Motorola MPX220 & etc. From = forum 34 "target =" _ blank "class =" replace keyword "> mpx220, etc. It seems that only Nokia has adopted RS-MMC, which is also specially customized for mobile phones, and has adopted low-voltage RS-MMC cards since 6630, so it seems that the specifications of RS-MMC are somewhat confusing and there are some compatibility problems.
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Although TF card is also a small memory card, it is very suitable for mobile phones, but its high price inhibits its popularity. Traditional SD and MMC are generally memory card specifications adopted by some early mobile phones. At present, the price difference between Mini SD and RS-MMC and ordinary SD and MMC cards is not big, and they will definitely become the mainstream configuration of mobile phones in the near future. The memory stick Duo is still a patent of Sony, and only Sony Ericsson's mobile phone has no choice but to use the memory stick Duo.
When choosing a memory card for a mobile phone, the first consideration is not access speed, but stability. If you buy the legendary ultra-fast card and it can't be used stably on your own machine, then everything is useless. Usually, choosing a memory card for a mobile phone is a headache, and we can't judge its performance on the mobile phone from the brand's popularity. Perhaps a certain brand of memory card enjoys a high reputation in digital cameras, but it is not necessarily that it performs equally well on mobile phones. The data stored in a digital camera usually won't be kept for a long time, and each photo takes up about the same capacity, so there won't be a lot of disk fragments when reading and writing. Unlike mobile phones, the size of the software they need to install or the size of the cache file generated by browsing the web pages are different. Frequent deletion and modification often cause a lot of disk fragments, so for memory cards, mobile phones are much more difficult to handle than digital cameras. In this way, it is time to test the stability of the memory card.
It should be noted that it is not the amount of data that affects the stability of the memory card, but the number of files on the card. If you store a 200MB movie, you may be safe. If you install dozens of softwares, you may not be safe. The capacity of mobile phone software is usually only tens or hundreds of KB, and the number of files that a 5 12MB card can store is amazing. The more files are deleted, the higher the stability of the card is.
For users of smart phones, the reading and writing speed of memory cards also needs to be considered. Now the processor speed of smart phone has reached a certain height, so the reading and writing speed of memory card is directly related to the performance of the system, which is obvious when playing high-quality video.