Toshiba external HDD not recognized by MacBook Air

I have a 1TB Toshiba USB3.0 external hard drive that I have been using for the last year or so to back up all my work data.
The drive works perfectly when I connect it to a PC (Dell desktop, laptop, HP laptop, etc.).  I even was using it last night on a PC.
However, my work recently replaced my PC with a MacBook Air, and the system will not recognize the drive.  USB port will power the drive (light comes on solid blue), but System Profile, Disk Utilities, and Finder do not recognize as attached.  Once again, I used last night without issue on a windows PC.
Any help would be appreciated.

diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         250.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *249.8 GB   disk1
                                 Logical Volume on disk0s2
                                 B094D0D3-A8B5-44EB-8C04-247F5B097D5F
                                 Unencrypted

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