your chances of data recovery drop significantly if the drive to be rescued is in use.
that low chance drops even closer to zero if you use the same drive as both source and target.
you are overwriting the very files you are trying to recover with the files just recovered.
and as frustrating as it is, please watch the language - little kiddies may be nearby.
I think more explanation on this 3TB is in order, like, why do you move it to & from its external caddy?
when you put it into the PC, is it a 'slave'?
what are the BIOS settings for the drives?
does Win7 detect the drive at all?
what's the drives age and SMART data?