Disk Erase Failed

Question

Hello,
I have 1TB WD external hard drive connected directly to my macbook pro, I have always used it without problems, but recently it was not recognized! I went to disk utility to format the drive but I get "Disk Erase failed" "Disk Erase failed with the error: unable to write to the last block of the device", I tried going to partition but it also gave the same answer. The status of the disk in the bottom are as follows:
Name : WD Elements 1042 Media
          Type :           Disk
          Partition Map Scheme :           Unformatted
          Disk Identifier :           disk1
          Media Name :           WD Elements 1042 Media
          Media Type :           Generic
          Connection Bus :           USB
          USB Serial Number :           575846314137323034303939
          Device Tree :           IODeviceTree:/PCI0@0/XHC1@14
          Writable :           Yes
          Ejectable :           Yes
          Location :           External
          Total Capacity :           1 TB (1,000,202,043,392 Bytes)
          Disk Number :           1
          Partition Number :           0
          S.M.A.R.T. Status :           Not Supported

Answer 1

The drive may be defective. You can try repartitioning it before the format to see if that helps, but if not the drive or the SATA controller in the enclosure is bad. I'd guess the drive. Try formatting as a single GUID partition, OS X Extended (Journaled) NOT case sensitive and see if you get anywhere.