lacie 2big dual hard drive mount

Im having an issue with mounting this drive, after turning on the drive I get this message the disk you inserted was not readable by this computer, however the hard drive does mount. Not only that it shows up in disk utility and allows me to erase and repartition, I have done this several times and still get the same error message when switching on the drive. If I press the ignore button on this error message I am able to use the drive as normal, loading files onto it etc etc. Can anyone help me with regards to clearing this error message bearing in mind ive used disk warrior also. Also bearing in mind the drives do not contain information I need to or wish to keep.