Newertech MiniStack Max 4TB 7200RPM DVD/CD Reader/Writer, or Blu-ray/DVD/CD Reader/Writer Multi-Interface: FireWire 800/400 (100MB/s / 50MB/s) USB 3.0/2.0 (300MB/s / 60MB/s) eSATA (300MB/s) MagLev fan (same as used in the Mac mini) offers frictionless, whisper-quiet operation Integrated Kensington Security Slot for theft prevention Identical footprint to 2010 and later Apple Mac mini (measures 2.33 (H) x 7.7 (W) x 7.7 (D) inches)