Why is the copying speed of a USB flash drive so slow?

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　For many office workers, USB drives are something familiar. So what are they used for? Most people would probably say that they are used for transferring and copying files. To transfer and copy files, one needs to copy the files onto the USB drive. However, after using a USB drive for some time, many people find that its copying speed seems to get slower and slower. What exactly causes this problem? Below, the editor will provide a detailed explanation! http://www.66868.com/uploads/allimg/150413/6-150413215425U2.png 1. First of all, we need to check whether there is any issue with the computer’s USB ports. 　　The method for testing a USB port is actually quite simple: one can obtain another USB flash drive, preferably one that has been tested and worked fine on another computer, and then insert it into the USB port of one’s own computer to conduct a test. If there are no problems, then it indicates that the issue is not related to the computer’s USB port. 　　2. Secondly, there may be too many junk files on the USB drive, which slows down the copying speed; we need to optimize the USB drive. The steps are as follows: First, return to the computer’s desktop, then right-click on the computer icon and select Properties. 　　In the opened properties window, switch the interface to the Performance tab, then sequentially click on File System → Removable Disk. Next, check the box for \"Write-back cache\", and finally click OK to save the settings.