This is how to move iPhoto photos to an external hard drive. On most newer Macs that are flash-based and/or Macs that are running out of internal hard disk space, storing photos on an external hard drive makes the most sense. Sharing photos on an external hard drive is less expensive and is easy to setup.
Available on Amazon.com – Seagate Expansion 8TB Desktop External Hard Drive USB 3.0 (STEB8000100)