it’s easy to do as root, but takes a little working to have a non-root user be able to write as well as read to the drive.
- edited /etc/group and added myself to a group #500
- edited the appropriate line in /etc/fstab:
/dev/sda7 /fat32 vfat uid=0,gid=500,umask=002 0 0
need to check that non group-500 members can’t write.