nbrown104; Hi ! Welcome to the forum.
In order to access that partition from the command line one has to mount it to the file system. Try this:
The partition must be cleanly (un)mounted prior to shutting the system down:
sudo fdisk -l # to identify the partition
sudo mkdir /mnt/Shared #make a mount point -note that linux is case sensitive "S" does not = "s"
sudo mount /dev/sda5 /mnt/Shared # attach to the file system - change "sda5" to "fdisk's" identification
ls -la /mnt/Shared/<directory>/<file> # to list contents
sudo umount /mnt/Shared