Please,Why cant my Windows Vista

format my External Samsung HDD ! Keeps coming up "windows could not complete format!" I had problems with it, from ejecting it without safely removing it.I couldnt save my data, so now I just want to clear the whole thing and reformat it! Is this possible! and how can I do it!

"windows could not complete format!" kind of implies it might be buggered

does it still show up with a drive letter! you could try running a chkdsk before formatting