How do I clone an external hard drive in Mountain Lion?

How do I use Disk Utitlity do clone a 1TB G-Drive to another G-drive same size. I tried using Disk Utility and Restore, but it failed. The new drive is brand new. Do I need to create an image, or if it is already formatted for Mac, is this unnecessary?  thanks.

Drive Preparation of the New Drive
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
Clone using Restore Option of Disk Utility
  1. Open Disk Utility in the Utilities folder.
  2. Select the destination volume from the left side list.
  3. Click on the Restore tab in the DU main window.
  4. Select the destination volume from the left side list and drag it to the Destination
      entry field.
  5. Select the source volume from the left side list and drag it to the Source entry field.
  6. Double-check you got it right, then click on the Restore button.
Destination means the new drive. Source means the old drive.

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