I recently downloaded Knoppix and it ran successfully. However, when I tried to copy files from my PC hard disk to a USB hard disk the files would not copy or move. Thinking it was a download problem and having tried several versions I sent for a disk from the states. Disappointingly this produces the same result. Help on the net suggests that the read/write option for the target disk needs to be changed and instructs the user to right click on the disk icon on the desktop to produce a menu to achieve the reset of the read/write option. Alas there are no disk icons displayed on the desktop. The disks are visible when using the file manager. Can anyone help me please?