To highlight just how bad this new Seagate drive is (thank God its going back), heres a S.M.A.R.T data comparison:
The drive seek error rate should be of particular note - every time a seek error has occured, the drive has made lots of unhealthy sounding clicking noises for about 20 seconds...
Rate of seek errors of the magnetic heads. If there is a partial failure in the mechanical positioning system, then seek errors will arise. Such a failure may be due to numerous factors, such as damage to a servo, or thermal widening of the hard disk. The raw value has different structure for different vendors and is often not meaningful as a decimal number.
The Samsung is over 3/4 full and not a single ECC error. That is formidable.