Many users are confused about the concepts of RAM, ROM and memory card. For example, some people will say that the "memory" of their mobile phone is 16G, while some users complain about why only 10G or less is available on a 16G ROM machine, while others are worried about why there is still a lot of space on the memory card, but there is not enough space to pop up when installing a large game. All of the above problems are common when we play the machine. The main content of this article is to introduce the knowledge of RAM, ROM and memory card of mobile phones and how to make better use of them.

First, let's explain the relationship between RAM, ROM and memory card. The RAM and ROM of mobile phones belong to semiconductor memory. The RAM of a mobile phone is often referred to as memory, which is the abbreviation of Random Access Memory, Namely, random access memory, which can read and write data randomly in the working state, and will lose data after power failure 。 The ROM of mobile phones is somewhat different from the traditional ROM (Read Only Memory), It is divided into two parts, one for the system and the other for the user to store data 。 The memory card is easy to understand. The common one is the tf card, Used to store user data.

RAM

RAM is memory. Mainstream mobile phones have 512M, 768M, 1G, 2G and other capacities, so the "16G memory" mentioned by some users certainly does not refer to RAM. RAM capacity can be divided into three types: nominal capacity, actual capacity and usable capacity. The nominal capacity is the capacity of mobile phone parameters, namely 1G and 2G. The actual capacity will be less than the nominal capacity. In addition to some small losses (different algorithms and particles), some mobile phones will also be occupied by the GPU, so the actual capacity seen by some 2G mobile phones will be 1.7G~1.8G. The available capacity is less than the actual capacity, because the system and background programs occupy it, commonly 2G 's mobile phone is available when it is turned on RAM There will be 1.3G Left and right, and 1G 's phone is available 400M about.

How can I save RAM?

Saving RAM is mainly to control the number of background programs. The methods introduced here are mainly applicable to Android phones. This problem does not exist in iOS and WP systems. Of course, this problem does not exist for Android phones with 2G capacity. To control the number of background programs, in addition to manually "closing the process", it is also necessary to prevent some programs from automatically starting in the background. This requires some third-party software to control the startup and self start items. Usually, this type of software needs to obtain root permissions.

ROM

ROM is the storage space as we say. The common capacities are 4G, 8G, 16G, 32G, 64G, etc. ROM also involves a capacity problem, which can be divided into nominal capacity, actual capacity and usable capacity. The nominal capacity refers to the above mentioned capacities. The actual capacity of the ROM is much smaller than the nominal capacity, because the ROM is divided into three parts, One part is used for the system, that is, the part we usually "swipe" into, and the other part is used for the installation of system software, for example, some mobile phones will be separated 2G It is used to install software, while the rest is at the disposal of the user as "internal memory card". The function of the internal memory card is the same as that of the tf card we inserted. We can copy the content we want at will. Of course, the functions of the internal memory card are not exactly the same as those of the tf card, Because the data packets of some software can only be placed on the internal memory card under normal circumstances, and the tf card cannot be used as the storage location of the data packets, this also explains why the user still prompts insufficient space when installing the software after inserting the mass memory card.

How to save ROM capacity?

Saving ROM is related to machine cleaning and usage habits. Some excellent systems have more remaining ROM capacity. In addition, you can delete some programs that come with the system. The software you use also needs to obtain root permissions. Of course, user habits are more important, Regularly clean the downloaded installation package and delete the rarely used software in the phone , which is not only conducive to saving ROM, but also allows the mobile phone to respond more quickly.

Memory card

The function of memory card has been mentioned in the introduction of ROM, which can be used to copy different files at the user's discretion. Many mobile phones now have a tf card slot so that users can expand their storage capacity. Of course, some heterogeneous mobile phones have less capacity and do not support tf cards and OTGs (Nexus 4: I'm lying on the gun...). The nominal capacity of the memory card is close to the actual capacity. For example, the usable capacity of a 16G memory card will reach 14G or even 15G. In the past, the ROM of some mobile phones was relatively small. After the tf card was inserted, it was completely used as the system memory card, that is, the data package of software and games can be put into the memory card for use. Even for some machines that cannot copy data packets to the tf card, they can also be "attached" to the machine through special methods to realize the special use of data packets on the tf card.

How to make better use of tf Card?

Better use of the tf card is mainly to transfer software and game data packets to the tf card for use. Now many third-party systems have the "tf card mount" function, but to achieve this function, which is particularly important for general mobile phones with a ROM capacity of 8G or less. With this function, you can better play large games or use navigation software.

Tf card mount software

Compare before and after mounting. Pay attention to the folder path, From external memory card to internal memory card 。

RAM

ROM

Memory card

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