This Seagate Medalist ST3660A internal desktop hard drive offers a storage capacity of 545.5MB and a form factor of 3.5 inches. It is a vintage piece that uses the PATA/IDE/EIDE interface to connect to your computer. The model number is ST3660A and it is a great option for those who are looking to upgrade their computer's storage capabilities. The drive is in good working order and is ready to be installed into your system.