How to detect whether U disk for expansion disk to determine the authenticity of u disk chip

　U disk mainly has two kinds of packaging structure:

1. Traditional for PCBA package structure.

2. Black Colloid package structure. The interior is mainly composed of a PCB board + main CONTROL + crystal oscillator + capacitive capacitor +usb head +led head +flash (Flash memory), the following figure:

PCBA Package Black Colloid Pack

(PS: Constant Add letter U disk specified chip packaging structure)

Features: simple process and low cost.

Features: Not easy to bad, high reliability, waterproof, shockproof, dustproof, magnetically. Disadvantage: Easy to bad, stable reliability is relatively poor

Disadvantages: Complex process and high manufacturing cost. Not waterproof, not shockproof, not dustproof, not magnetic.

Open u disk shell, you can clearly see the package of your U disk packaging structure.

How to detect u disk? U disk quality testing here moderators recommend H2test Software, this software pro can Baidu under, many places can be open to free test software.

The function of this software is mainly:

1. To detect whether your USB disk expansion, the actual use of capacity

Is there a large number of bad blocks (inferior chips) in the 2.U disk?

3. Clearly shows the actual reading and writing speed of U disk.

The detailed software trial operation is as follows: Click the Start software,

Then choose the language for English (other languages I do not know, hehe), click "Select Target".

Select the USB disk letter you want to test, click Confirm. (Here the U disk letter is H disk)

Select "All available spaces" to detect all available capacity and then click "Write+verify" to start the read and write test.

Then the automatic detection, according to the size of the different needs of the test time is also different.

The test report finally came out, display moderator's 8G u disk actual usable capacity for 7703MB test results show no problem, the average write speed of 5.66m/s, the average read out speed of 20.2m/s.

Although its testable capacity is shown as 7963MB, the test results show that only 3.7GB is the actual usable capacity, the remaining 4GB capacity is not available, it is obvious that this is the "expansion disk", is the actual 4G capacity of the chip expansion into 8G.