This article tells you why your phone memory card is smaller than the nominal value

There are two large-capacity storage media, NAND FLASH and eMMC, on the market, which are the main storage media for various mobile terminals and mobile phones. What is the difference between the two, and what is the relationship between the actual size of the memory chip and the nominal value? We always talk about mobile phone memory, but what kind of media is used for storage? 99% use NAND Flash and eMMC storage media. eMMC was born to satisfy the ever-increasing system files after the rise of smart phones in recent years. It is an upgraded version of NAND Flash. Its structure is as follows:

This article tells you why your phone memory card is smaller than the nominal value

Probe high frequency needle JTK-50L-Q There are 5 needles in the high frequency needle

This article tells you why your phone memory card is smaller than the nominal value

There are two large-capacity storage media, NAND FLASH and eMMC, on the market, which are the main storage media for various mobile terminals and mobile phones. What is the difference between the two, and what is the relationship between the actual size of the memory chip and the nominal value?

We always talk about mobile phone memory, but what kind of media is used for storage? 99% use NAND Flash and eMMC storage media. eMMC was born after the rise of smart phones in recent years to meet the ever-increasing system files. It is an upgraded version of NAND Flash. Its structure is as follows:

This article tells you why your phone memory card is smaller than the nominal value

Why is the actual storage capacity of the 16G, 32G and other mobile phones we come into contact with is always less than these values? Is it because mobile phone manufacturers deliberately reduce storage capacity in order to reduce costs, or are there other reasons?

Reason 1: NAND Flash's own characteristics

As can be seen from the above figure, the main storage unit in eMMC memory is NAND Flash. Its structure and production process cannot guarantee that each storage unit is good, and invalid blocks will be randomly generated. These invalid blocks cannot determine the state during programming, which is what we often call "bad blocks". "Bad blocks" will occupy part of the NAND Flash storage space. The bad block storage structure of NAND Flash is as follows:

This article tells you why your phone memory card is smaller than the nominal value

In this way, a 16GB eMMC chip will appear, and the actual usable space is not enough to 16G. The eMMC chip as shown in the figure below has only 15.7G capacity for file storage.

This article tells you why your phone memory card is smaller than the nominal value

Reason two: mobile phone manufacturers pre-install operating systems

The operating system versions of different mobile phone manufacturers are different, so in fact, the built-in storage space that everyone can use will be further reduced. If the Android phone has 16G storage space, in fact, the data partition is divided into 2.93G, except for system partitions such as data/system/cache (the size of these partitions is determined by the manufacturer), the rest is the storage space available to users. The Android system takes up a part of the space, as does the Apple mobile phone system. For example, Apple’s IOS9.2 system is 1.4G as large:

This article tells you why your phone memory card is smaller than the nominal value

The following is a comparison chart of the actual 16G space available for some flagship mobile phones.

This article tells you why your phone memory card is smaller than the nominal value

Based on the above two reasons, the answer that the capacity of 16G mobile phones cannot reach the nominal value is clear. Due to the phenomenon of bad blocks in NAND Flash, the absolute storage capacity is reduced accordingly; coupled with the size of the mobile phone operating system, and some pre-installed software, the nominal 16GB mobile phone, the space left for users to use is further reduced .

Mobile phone manufacturers should use software to detect fast chip failures, pick out bad chips, and detect bad block addresses in time during NAND Flash programming to prevent bad programming. The ZLG Zhiyuan Electronics SmartPRO 6000F-PLUS burner can efficiently detect chip bad blocks, and the flash programming speed of 200MB/S can quickly copy eMMC and improve eMMC programming capacity.

Mini Gaming PC


What suddenly appear into your mind when hear Mini Gaming PC? Is there quality heat-releasing fan and box design of Mini Gaming PC Build? Does it run stable and smoothly when handle heavier jobs, like Photoshop, Pr, engineering design and drawing, 3d Max, big games, etc. ? now we can be responsible to answer [ Yes". No matter cheap mini gaming pc or Mini Gaming PC Under $500, equips with quality fan to heat releasing. Therefore, no need to worry that again.

To processor, can do from intel celeron j4125, N5105 up to i3, i5 i7 10th 11th 12th with or without video graphics. To slots, same rich as traditional computer tower, like above 4 or 6 usb ports, 2 Rj45, VGA, PD, slot, etc.

You can also find Mini Gaming PC, j4125 Mini PC ,Custom All In One PC, windows 10 Education Laptop,Quad Core Processor Laptop, 15 Inch Gaming Laptop ,windows Yoga Laptop , 8 inch Android Tablet, etc.

If any other special requirements interest, you can also let us know, will try our best support you.

Meet your unique demand in this field is our mission, so just feel free contact us whenever you have different idea.


Mini Gaming PC Build,Cheap Mini Gaming PC,Mini Gaming PC Under $500,Mini Gaming Desktop

Henan Shuyi Electronics Co., Ltd. , https://www.shuyicustomlaptop.com