Sometimes we are using a U disk can not copy the phenomenon, prompted Windows delay write failed, this is mostly caused by the virus, of course, there are other reasons, I will analyze the 1.1 points below.
1, the virus reason.
Many times the virus will be with U disk automatically broadcast virus, causing U disk can not be normal copy. At this time we can use U disk to kill tools or anti-virus software, the overall killing virus.
2, u disk or mobile Equipment and computer contact is not good.
If you use a data cable connection, you can try a switch interface or data cable, or insert a U disk or mobile device to restart the computer. You can format a U disk or mobile device once, even if it is not possible to make sure the connection is correct.
Double-click My Computer on the desktop to open it, click on the U disk or mobile device right click "Format", in the Format window select the "File System" (can be FAT32 or NTFS) and then tick "quick Format" and then click "Start" to format the finished.
If formatting is wrong, or the hint is not formatted, you can use a special USB format software (such as: Ms-format) to format the U disk.
3, the U disk itself hardware problems.
This situation can be used U disk low grid tools, about the use of low grid tools Home of the U disk Tutorial has a lot of corresponding articles. Here I will not say more, if you really feel trouble, buy a U disk will be your best choice.