Victoria 4.3 Freeware (beta version) log file. 16.03.2015
20:59:54 : Starting Victoria 4.3 Freeware (beta version), CPU frequency: 1839,77 MHz, Windows unknown NT found.
21:00:04 : Model: WDC WD20EFRX-68AX9N0; Capacity: 3907029168 LBAs; SN: WD-WMC1T2939190; FW: 80.00A80
21:00:13 : Get passport... OK
21:00:13 : Recallibration... OK
21:00:14 : Get S.M.A.R.T. command... OK
21:00:14 : HDA temperature = 37 °C
21:00:14 : Starting seek test: 0...3907029167 LBA, reading, Timeout = 200ms
21:00:15 : Stopping SCSI drive... HD Spindle is stopped
21:00:36 : Get passport... OK
21:00:37 : Recallibration... OK
21:01:22 : Starting Reading, LBA=0..3907029167, sequential access w. REMAP, tio 500ms
21:01:23 : Warning! Block start at 0 = 799 ms
21:01:25 : Warning! Block start at 256 = 865 ms
21:01:26 : Warning! Block start at 512 = 785 ms
21:01:27 : Warning! Block start at 768 = 954 ms
21:01:29 : Warning! Block start at 1024 = 673 ms
21:01:30 : Warning! Block start at 1280 = 734 ms
21:01:31 : Warning! Block start at 1536 = 892 ms
21:01:33 : Warning! Block start at 1792 = 739 ms
21:01:34 : Warning! Block start at 2048 = 661 ms
21:01:35 : Warning! Block start at 2304 = 740 ms
21:01:36 : Warning! Block start at 2560 = 512 ms
21:01:37 : Warning! Block start at 2816 = 872 ms
21:01:39 : Warning! Block start at 3072 = 905 ms
21:01:40 : Warning! Block start at 3328 = 844 ms
21:01:41 : Warning! Block start at 3584 = 703 ms
21:01:43 : Warning! Block start at 3840 = 727 ms
21:01:44 : Warning! Block start at 4096 = 635 ms
21:01:45 : Warning! Block start at 4352 = 779 ms
21:01:46 : Warning! Block start at 4608 = 652 ms
21:01:47 : Warning! Block start at 4864 = 907 ms
21:01:49 : Warning! Block start at 5120 = 830 ms
21:01:50 : Warning! Block start at 5376 = 884 ms
21:01:51 : Warning! Block start at 5632 = 1079 ms
21:01:53 : Warning! Block start at 5888 = 911 ms
21:01:54 : Warning! Block start at 6144 = 976 ms
21:01:55 : Warning! Block start at 6400 = 969 ms
21:01:56 : Warning! Block start at 6656 = 710 ms
21:01:58 : Warning! Block start at 6912 = 819 ms
21:01:59 : Warning! Block start at 7168 = 840 ms
21:02:00 : Warning! Block start at 7424 = 958 ms
21:02:01 : Warning! Block start at 7680 = 935 ms
21:02:02 : Warning! Block start at 7936 = 937 ms
21:02:03 : Warning! Block start at 8192 = 617 ms
21:02:05 : Warning! Block start at 8448 = 1252 ms
21:02:06 : Warning! Block start at 8704 = 948 ms
21:02:07 : Warning! Block start at 8960 = 778 ms
21:02:08 : Warning! Block start at 9216 = 916 ms
21:02:10 : Warning! Block start at 9472 = 936 ms
21:02:11 : Warning! Block start at 9728 = 837 ms
21:02:12 : Command interrupted by user!
21:02:12 : Warning! Block start at 9984 = 827 ms
21:02:12 : ***** Scan results: Warnings - 40, errors - 0 *****

Do you need to recover data from the drive or do you want to just re-use the drive ?
I would replace the drive if data is not needed and apply the "slow fix" to attempt to recover the data,
The access to the sectors is .... slow.
If the OS itself is not playing tricks, like having a virus that slow stuff down, (you can test by scanning other drives) then your WD sure do have a probelm as it shouldn't be se slow to access it.

Bin the drive and buy a new one.
Regards.