MacBook Pro won't read external HDD

Hi all,
I have an early 2011 MacBook Pro running OS X 10.9.5 (13F34). I have been using a Seagate 2.0 external USB HDD for movies etc, but all of a sudden about a month ago my Mac just stopped reading the Seagate HDD. I cannot access anything on the HDD through the Mac. It reads the HDD in Disk Utility, but if I try and erase/reformat etc I get the same error message repeatedly (Unable to write to the last block of the device).
Can ANYONE help me with this? Please!
Thanks in advance!
Daniel.

Attach the HDD to the MBP and open Disk Utility.
Click on the Seagate HDD name and volume, each time clicking on the Information icon. See this example:
Please post the following two images:
Ciao.

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Triple-click anywhere in the line below on this page to select it:
{ diskutil list; echo; diskutil cs list; } | open -ef
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the Terminal application in any of the following ways:
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Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign (“$”) to appear.
A TextEdit window will open with the output of the command. If the command produced no output, the window will be empty. Post the contents of the TextEdit window (not the Terminal window), if any — the text, please, not a screenshot. The title of the window doesn't matter, and you don't need to post that.
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