External Hard Drive Fails to Mount

I have a 1TB external hard drive disk2 below, that fails to mount. I have run Utilities/Disk Utility and completed first aid successfully (verifying and repairing) but I am still unable to Mount the drive. I have also tried mounting the drive from the disk utility but that was not sucessful... it suggests running first aid but I have already done that. First aid results, also included below.
Here is the termal commands and response used, without success:
Jamess-iMac-7:~ jamesbowtell$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            999.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage                         2.0 TB     disk1s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:                  Apple_HFS 1TB Storage             999.9 GB   disk2s2
/dev/disk3
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS G-DRIVE                *2.0 TB     disk3
Jamess-iMac-7:~ jamesbowtell$ diskutil mount disk2s2
Volume on disk2s2 failed to mount
Jamess-iMac-7:~ jamesbowtell$
Verifying partition map for “Hitachi HDS721010DLE630 Media”Checking prerequisitesChecking the partition listChecking for an EFI system partitionChecking the EFI system partition’s sizeChecking the EFI system partition’s file systemChecking all HFS data partition loader spacesChecking booter partitionsChecking Core Storage Physical Volume partitionsThe partition map appears to be OK
Verifying and repairing partition map for “Hitachi HDS721010DLE630 Media”Checking prerequisitesChecking the partition listAdjusting partition map to fit whole disk as requiredChecking for an EFI system partitionChecking the EFI system partition’s sizeChecking the EFI system partition’s file systemChecking all HFS data partition loader spacesChecking booter partitionsReviewing boot support loadersChecking Core Storage Physical Volume partitionsUpdating Windows boot.ini files as requiredThe partition map appears to be OK
Please help.

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