M28E1  
    1. 8 x 2.5" Hot-swap SAS / SATA Hard
    Disk Drive Tray
2. Overheat LED and Alarm
3. Fan Failure LED and Alarm
4. Drive Activity LED
5. Drive Failure LED
6. 2 x 5.25" Drive Bay Enclosure
7. 8cm Cooling Fan Subsystem
8. 1 x Expander Supporting SAS /SATA HDD