Omit FAT32 Parition from automatic mount

Question

I have an external drive with an HFS partition, and a FAT32 partition my dad uses. How can I prevent the FAT32 half from automatically mounting? It appears that this partition does not have a UUID

I have previously tinkered with /etc/fdisk to exclude devices from automatic mounting, but that is for devices that have UUIDs.

$ diskutil info FD_SHARE
   Device Identifier:        disk2s3
   Device Node:              /dev/disk2s3
   Part of Whole:            disk2
   Device / Media Name:      Untitled

   Volume Name:              FD_SHARE
   Escaped with Unicode:     FD_SHARE

   Mounted:                  Yes
   Mount Point:              /Volumes/FD_SHARE
   Escaped with Unicode:     /Volumes/FD_SHARE

   File System Personality:  MS-DOS FAT32
   Type (Bundle):            msdos
   Name (User Visible):      MS-DOS (FAT32)

   Partition Type:           Microsoft Basic Data
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported

   Total Size:               516.7 GB (516675338240 Bytes) (exactly 1009131520 512-Byte-Blocks)
   Volume Free Space:        135.8 GB (135787216896 Bytes) (exactly 265209408 512-Byte-Blocks)
   Device Block Size:        512 Bytes

   Read-Only Media:          No
   Read-Only Volume:         No
   Ejectable:                Yes

   Whole:                    No
   Internal:                 No