Welcome to LQ.
You may have used this command ?
cp /usb0/Applications/Server/AirSync/Application/linux/airsync.bin
... which is wrong.
cp /usb0/Applications/Server/AirSync/Application/linux/airsync.bin .
(where the period ( . ) means the current directory), may work.
Or you can type another destination e.g. /home/<user>/tmp/
http://www.linuxquestions.org/linux/...Ask_a_Question