@ Golden,......... thx. for info.
Are you suggesting, I shouldn't ever transfer (paste) data from my Laptop to my 500gig (external drive - which is affected) ?
and about making partition,
Could you help me in 'creating the partition' (as u suggest), since I didn't do it earlier, but can, if define it's procedure ...
I'll think about RMA, first to assure my data is backed-up.