If clicking is due to bad sectors you can fix that* programs that erase hdd like zerofill, low lewer format can do trick
there are couple programs that can attempt to repair HDD like HDD Regenerator (google it)
I zero-filled, full format, and then check with windows error check tool (with 2 options checked) that fixed my usb drive
here is free tool, if you can complete one pass it might fix
http://hddguru.com/software/2006.04.12-HDD-Low-Level-Format-Tool/