Virus attack and physical damage are most common in portable devices like micro SD cards and pen drives, which corrupts the data on the device and make it hardly impossible to retrieve the original data back, nevertheless, we lost the data's but not the device, once we perform a format option on the damaged device since then it will let us at least to use the device. But the next problem arises here is that when you try to format the damaged device it's quite shocking to see an error message popping out of the screen "Windows was unable to complete the format". So what is the next thing that you could do, you lost the data but had a hope to recover the USB flash drives at least, but the error message makes it even worse. Hence I came here with a solution to format the USB flash drive completely, follow the simple steps. Read Also: How to remove shortcut virus from USB flash drives/Pen drives How to Format USB Flash Drive, When Windows Unable to Complete the F...