HT1338 cannot write to usb harddrive

Hi,
Just bought a 1TB WD Elements HDD, plug in able to read from the HDD, but unable to write. Anybody encounter this problem before??

Most HDs come formatted for Windows, with Master Boot Record partition map and NTFS file system.
Macs can read this, but not write to it.
You need to initialise the disc and reformat for Mac.
Warning! This will erase all data on the disc - so make sure anything you need has been moved to your Mac before commencing.
In Disk Utility, select the WD (the line with the manufacturer's name and capacity of the drive).
Select the Partition tab.
From the dropdown above the graphic, choose 1 partition.
Click on the Options button below the graphic and select GUID partition map.
Choose Mac OS Extended (Journalled) for the file system (format drop down on the right).
Give it a name.
Click Apply at the bottom right.
When it's finished the new volume with the name you gave it will appear indented below the selected line.
You can now read and write to the drive, and use it for a bootable clone if desired.

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