My Tech Update - Pen drives or USB flash drives are quite popular due to ease of carrying them and amout of data they can carry. But some USB flash drives use write protection button which prevents any data being moved to or from the pen drive. However if you turn off that switch you can write any data on your USB flash drives. But sometimes even normal pen drive’s become write protected due to umpteen reasons. It might be due to some virus sitting in it, it may be full already or may be the file itself is write protected.