3.5" FDD on the top of case to fulfill ergonomic design. Super Capacity for Midi-Tower with 10 Drive Spaces. Real P4 Case: support P4 full size M/B (maximum size:12" x 9.6"). Better Ventilation for System3 spaces for second fan (two 6 cm fan in the front and one 8 cm on the rear panel. The front opening door with optional USB port or USB/AUDIO/IEEE1394 ports. Two Colors optional (Standard Ivory or Champagne silver). Right/Left strip & power/reset buttons with silver-coating. Free service for Logo Screen-Printing on the removable 5.25" FDD Cover. Screwless & Wireless front panel. Tool-free design for 2 side-covers & top-cover. Sliding-drive-rail for all 5.25" space, co-existing assembly for "Drive Rail & Screw Bolt" on the 5.25" bracket. The Slide-in/out M/B base fully meet ATX, microATX and Baby AT formats. Detachable 3.5" Bracket. Co-existing for "stand-off" and "brass-screw" on the M/B Base fixing. thread to meet different requirements from customers. Approved by Intel P4.