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How to test the usb disk we buy is Expansion disk?Note: I believe many people have already found when using flash disk storage speed is slow and the flash symbol often displayed as EXE in the PC machine, as poisoning. This is because of the expansion disk. So, what is the expansion flash disk, what it will bring to us, how can we tell?
一、First: The concept of a expansion flash disk
Expansion flash disk refers to the flash disk using related software to show a bigger capacity than it's real capacity in the computer (such as the actual 512M flash disk capacity display 2G), but the extra capacity cannot be normal used. When stored files exceeds the actual volume, files stored in the extra capacity region are not available, the files if then copy will be damaged.
二、Second, the danger of the expansion flash disk
The real capacity of the expansion flash disk is small, so in the copy process it is prone to error, which will lead file missing, causing irreparable loss.
三、Third: the expansion flash disk detection
The first step: Detect the actual capacity of the flash disk
（1）Required tools: MyDiskTest
(2) The specific operation: select the flash disk, detect the actual capacity.
The second step: to partition flash disk
（1）Required tools: Patition Magic Version (WINDOWS environment)
（2）the specific operation:
A. select operation: select flash disk, delete the partition, creating a new partition, the partition size set to the actual capacity of the first step testing, confirm after formatting. Ignore the remaining partition showed unassigned, which is false capacity.
B. perform operations: Operations - Application changes.
C.After PM program execute, the flash disk has already had its can-be-use room,the same with its actual capacity, Done! when the flash disk partitions need to note one point: the new partition must specify one disk(optionally choose one out of the existing disk), otherwise it cannot be displayed when you plug the usb disk next time. After so many steps, flash has been restored to its actual capacity.
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