What does USB expansion disk mean?

U disk expansion disk refers to using relevant software to make a U disk with a small capacity display a large capacity on the computer (for example, a 512M disk appears as 2G); but because its actual capacity is limited, the extra The memory cannot be used normally. Except for the loaded data within the effective capacity space, it can be saved intact. Other files actually do not exist, so the data outside the actual capacity will be damaged. .

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

What is a U disk expansion disk?

U disk expansion disk refers to using relevant software to allow a U disk with a small capacity to be displayed on the computer The resulting capacity is very large (for example, 512M appears as 2G). However, the excess memory cannot be used normally. As long as the files stored in this kind of U disk exceed the actual capacity, the files with the extra capacity will not be available (for example, songs cannot be used). Listen, the video cannot be watched), or it will be damaged if copied out again.

U disk expansion Although its actual capacity is very small, it has a large space outside the actual capacity. Although there is no storage space, it still feels like there is space, so I am still adding it to the U disk. Save the file and it feels like it can still be installed after it is installed. However, because its actual capacity is limited, the loaded data can be saved intact except within the effective capacity space, and other files actually do not exist, so the data outside the actual capacity will be damaged. .

When encountering an expansion disk, there is no way. You can only use mass production methods to restore the actual capacity of the U disk to prevent data loss due to inadvertent exceeding the actual capacity of the U disk.

U disk capacity expansion is mainly aimed at U disk counterfeiters on the market. Through technical means, a small-capacity U disk can display more than its size on a PC. The USB flash drive has its own storage capacity and is sold at a high price. For example, a 256 M U disk can be expanded to 8 G through technical means and then sold at the price of 8G. If the user stores things in the U disk, all the things exceeding 256 M will be lost. At the same time, the U disk will The storage speed is very low, and the U disk symbol is often displayed in EXE format on the PC, which looks like poisoning and cannot be used. Many parallel-imported U disks often undergo similar expansions, and this U disk expansion can be detected through software.

Test software

• MyDiskTest

  A tool for capacity expansion identification of mobile storage products such as U disk/SD card/CF card . It can easily detect whether the storage product has been expanded in capacity and replaced with inferior ones. It can also detect whether there are bad blocks in FLASH flash memory and whether black chips are used without destroying the original data on the disk. It can also test the reading and writing speed of U disk and conduct aging tests on storage products. It is a must-have tool for you to choose USB flash drives and memory cards.

• cardtest

  A free software for diagnosing flash memory cards, such as CF, SD, MMC, XD, etc. Since version 1.2, cardtest supports recovering original files of missing JPEG images. cardtest can be used to: determine whether a flash card is valid; detect flash card speed, including write and read speeds at different file sizes; check the flash card's raw data and let experts make modifications. (Available if you try to repair files); Reports flash card drive information including manufacturer name, model name, firmware version, total capacity, remaining capacity and more; Supports retrieval of JPEG images lost by accidental operation; Erase All data is guaranteed to be secure.

• UWriteTest

  This software automatically renames and copies specified JPG pictures into the storage device. You can easily select all visible pictures to view their properties and obtain the U disk's properties. For the actual capacity, you can also know where the bad sectors of the USB flash drive appear by looking at the serial number of the picture that is not displayed. In addition, you can know the performance of the USB flash drive by checking the speed of copying files during copying.

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