How do I run safecopy in terminal?

I'm very new to terminal and Linux. I have a crashed external hard drive that is spinning but won't appear on the desktop. I ran safecopy from terminal and this is what it said at the end Description of output: . : Between 1 and 1024 blocks successfully read. _ : Read of block was incomplete. (possibly end of file) The blocksize is now reduced to read the rest. |/| : Seek failed, source can only be read sequentially. > : Read failed, reducing blocksize to read partial data. ! : A low level error on read attempt of smallest allowed size leads to a retry attempt. [xx](+yy){ : Current block and number of bytes continuously read successfully up to this point. X : Read failed on a block with minimum blocksize and is skipped. Unrecoverable error, destination file is padded with zeros. Data is now skipped until end of the unreadable area is reached. < : Successful read after the end of a bad area causes backtracking with smaller blocksizes to search for the first readable data. }[xx](+yy) : current block and number of bytes of recent continuous unreadable data. I don't know what to do next. Is it telling me that it cannot be resurrected or is it telling me that it is waiting for me to do something?