Question : Problem: Ext HD not showing full capacity.  How do I fix this?

Got a 400GB drive that is only showing as a 100GB drive when connected externally.  I don't see any other partitions.  How do I get ti to show the full 400GB?  There is no important data on it.  Can it be reformatted?  I tried to choose this option but it only showed 97.6GB under capacity.

Answer : Problem: Ext HD not showing full capacity.  How do I fix this?

As you said the drive can be wiped.

So right mouse click the first NTFS partition and click on Delete Partition.  This will make the whole lot unallocated.  Then right mouse click and Create a new one. Keep clicking on next until it finishes then the whole lot wil be seen as one new drive.