well i stripped out my external and tried the hdd in my laptop.
works a treat
formatted the hdd ( not quick), re tested with WD diagnostic and still fail, tried windows check disc and quess what
that failed right at the end after about 5 hours working,
sod it I'm just gonna bin it.
have found a 1 TB for £60 ($90) at pc world, either as a external hdd or internal hdd.
not sure which way I'll go but seems the best way for now.
Did read that the external hdd have a habit of over heating as the case's are enclosed ?? no idea if true, may drill a few holes in the casing