In order to Safely eject a drive in a MAC environment, perform the following;

1. First, Lock the Encrypted partition by clicking on 'Lock' in the drive's Control Panel

The following screen will be presented;

2. Locate and click on the 'Unlocker' label in the Tittle bar and select 'Quit Unlocker'

The 'Private' Drive (secured Volume) will disappear from the Desktop and only leave the  Unlocker' Volume

3. Click and Drag the 'Unlocker' volume to the 'Trash Can' located in the bottom right hand corner of the Desktop.

Once the "Unlocker' drive disappears from the Desktop, you can physically disconnect the drive from the MAC.