1) My old HDD (in USB3 enclosure) is on the verge of failing so I bought a new one (almost exactly the same 1TB WD) with a separate enclosure (they only had USB2, so it's USB2, slow). 2) I partitioned and formatted the new one in the USB2 enclosure and it works fine - I managed to copy all the data from the failing drive to the new one. 3) The problem begins when I connect the new drive to the old enclosure (USB3) - while the old HDD works in both enclosures the new one only works in the old one. In the new one it shows that the two partitions I created are much smaller than they should be.
What could be the problem?
I'm afraid to risk reformatting the new drive again (in the new enclosure) because the old HDD might fail at any time (it doesn't want to start sometimes and has many bad sectors). And using it in USB2.0 enclosure is also not an option - it's much slower than the USB3 enclosure... I'm considering buying a third enclosure, but I'm afraid it won't solve the problem.
The partitions show wrongly in Ubuntu disk utility and gparted (when the new disk is in USB3 enclosure).