company looked at disc and said that the electronics around the disc had gone belly up, but they could see the data on the disc by other means. cost £175 to recover data.
I stripped the disc out of the enclosure and hooked up to old PC as a slave (jumped pins 3&4). Windows does not see the directory structure, but shows up under device manage as correct WD disc.
Duel booted into linux and similar story - disk utility see the disc and would allow me to make a new volume or partition, but again cannot see the directory structure.
I am guessing then that the disc is ok, but somehow the data on it is corrupted in some way.
Also tried in a more new PC in case 320Gb 2nd drive was not supported - same outcome
Question is what to try next ??
any help much appreciated (must say I dont care much for this blue background when typing)