With Power Supply: No Power Supply Mounted: Bottom With Side Panel Window: No External 5.25" Drive Bays: 3 Internal 3.5" Drive Bays: 13 (2 from X-dock, Middle cage for 5 HDDs, Bottom cage for 6 HDDs) Internal 2.5" Drive Bays: 11 (converted from 3.5" bay) Front Ports: USB 3.0 x 2, USB 2.0 x 4, E-SATA x 1, Audio In and Out Motherboard Compatibility: Micro ATX / ATX / Extended ATX / XL-ATX / SSI CEB / SSI EEB