NOTE A-class volumes can only be reshared in OS X Mavericks (v10.9) and later by using SMB sharing.  Prior versions of MacOS X do not support file sharing with VTrak A-Class.  

In order to share an A-class volume in OS X Mavericks, you must first open the Sharing pane in System Preferences and then select the check box for File Sharing:

Then, under Shared Folders, select the “+” button.  This will bring up a menu where you can add the A-class volume – which will be listed under Devices.  In the example below, the A-class volume is named “FS1”:

Select the volume and then click “Add”.  Your A-class volume will now be listed under Shared Folders:

For more information or advanced configuration options, please see Apple KB HT5884: