[ubuntu] pendrive error..

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http://ubuntuforums.org – hi, while downloading any file directly to my pendrive...its showing the error mentioned below ....please help me ..how to resolve this error...in pendrive,files show some lock sign...what is it ..it doesnot copying any file neither its deleting from pendrive.... "/media/PENDRIVE/lesson6.html could not be saved, because the disk, folder, or file is write-protected." need urgent help.. thank u.. (Hardware)