I did not have any problem to use my USB until yesterday and left the USB plugged in my laptop, but today my laptop doesn't show the USB. I have tried other USBs to check if it is my computer problem, but they are shown at the same laptop. And I tried another laptop to see the USB, but it did not show it either. So I think it is a problem with the USB. What should I do?
It is possible to get a virus on a USB drive. However, typically those viruses main purpose is to remain dormant and camouflaged while on the USB drive, so that the USB drive can be plugged into as many different PC's as possible to infect them all.
In your situation, your drive probably died. Unplug it and try another PC or plug it into another port on that PC to ensure that the port it was plugged into didn't die. If you get a message saying something like: "You need to format this drive to use it first", when you plug it in, then either the file system is corrupt and you probably lost all the info on it, or the drive died and you definitely lost everything on it.
In your situation, your drive probably died. Unplug it and try another PC or plug it into another port on that PC to ensure that the port it was plugged into didn't die.
Agreed, though it looks like he already tried it in other computers. Really hard to tell due to the broken English, though.
We really need a sub-forum for "Help, I kept my only copy of critical data on a flimsy USB drive and now it's dead!"
Are you sure, I thought he said that he tried other USB drives on the same computer... Idk. Lots of broken English in these threads now a days. Not sure if it's sucky translation or poor English skills.
Well, have you tried to test it with Windows Error-checking tool? http://windows.microsoft.com/en-IN/windows7/Check-a-dri...
Sometimes, if the drive is not damaged seriously, this tool always can automatically fix it for you.
However, if this tool doesn't make a difference, as johanharry writes, you may try a free USB drive recovery tool to take a chance, if you have important data saved on this USB drive. Don't worry, this free one has ever recovered all my files from a formatted hard drive. Therefore, I truest it will help you out, too. Note: In the future, you should remember to eject your drive ever time you use it in case of similar problems.
You also should remember to make data backups in case of any data loss.