Can't connect my external hard drive to my Mac Book Pro. Any thoughts?

I have a 2.0 TB WD Mybookessential as an external hard drive to my Mac Book Pro and I'm getting a "The disk you inserted was not readable by this computer" message every time I try to remount it. Any thoughts?

Thanks for the suggestion, Cattus, it is in fact a formatted disk with a lot of valuable data, so I do not want to reformat the disk.
I followed your advice, however the repair failed because of an "invalid B-tree node size".
This is the log:
2011-12-27 17:03:33 +0000: Error: Filesystem verify or repair failed.2011-12-27 17:03:33 +0000:
2011-12-27 17:03:33 +0000: Disk Utility stopped repairing “disk1s2” because the following error was encountered:
Filesystem verify or repair failed.
2011-12-27 17:03:33 +0000:
2011-12-27 17:06:35 +0000:           Name :           WD My Book 1110 Media
          Type :           Disk
          Partition Map Scheme :           GUID Partition Table
          Disk Identifier :           disk1
          Media Name :           WD My Book 1110 Media
          Media Type :           Generic
          Connection Bus :           USB
          USB Serial Number :           574D415A4131363338333935
          Device Tree :           /PCI0/EHC1@1D,7/@2:0
          Writable :           Yes
          Ejectable :           Yes
          Mac OS 9 Drivers Installed :           No
          Location :           External
          Total Capacity :           1.8 TB (1,999,696,297,984 Bytes)
          S.M.A.R.T. Status :           Not Supported
          Disk Number :           1
          Partition Number :           0
2011-12-27 17:06:35 +0000:
2011-12-27 18:22:01 +0000: Verify and Repair volume “disk1s2”
Starting repair tool: 2011-12-27 18:22:01 +0000
2011-12-27 18:22:01 +0000: Checking Journaled HFS Plus volume.
2011-12-27 18:22:15 +0000: Invalid B-tree node size
2011-12-27 18:22:15 +0000: Volume check failed.
2011-12-27 18:22:15 +0000: Error: Filesystem verify or repair failed.2011-12-27 18:22:15 +0000:
2011-12-27 18:22:15 +0000: Disk Utility stopped repairing “disk1s2” because the following error was encountered:
Filesystem verify or repair failed.
2011-12-27 18:22:15 +0000:
2011-12-27 18:31:57 +0000:           Name :           WD My Book 1110 Media
          Type :           Disk
          Partition Map Scheme :           GUID Partition Table
          Disk Identifier :           disk1
          Media Name :           WD My Book 1110 Media
          Media Type :           Generic
          Connection Bus :           USB
          USB Serial Number :           574D415A4131363338333935
          Device Tree :           /PCI0/EHC1@1D,7/@2:0
          Writable :           Yes
          Ejectable :           Yes
          Mac OS 9 Drivers Installed :           No
          Location :           External
          Total Capacity :           1.8 TB (1,999,696,297,984 Bytes)
          S.M.A.R.T. Status :           Not Supported
          Disk Number :           1
          Partition Number :           0
2011-12-27 18:31:57 +0000:

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Can't connect my external hard drive to my Mac Book Pro. Any thoughts?

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