Item Control/Feature Icon Description14 Four Mini-SAS HighDensity (HD) ports (Slot1/Port 1, Slot 1/Port 2,Slot 1/Port 3, and Slot 1/Port 4)— Front-end connectivity portsNOTE: The mini-SAS HD ports are for front-endconnectivity only and cannot be used for back-endexpansion.15 Mini-SAS port B (Slot 2/Port 2)Back-end expansion port B16 Mini-SAS port A (Slot 2/Port 1)Back-end expansion port ASC4020 Storage System DrivesThe SC4020 storage system supports only Dell Enterprise Plus hard disk drives (HDDs) and Dell Enterprisesolid-state drives (eSSDs).Figure 13. SC4020 Storage System Drive IndicatorsItem Control/Feature Indicator Code1 Drive activityindicator• Blinking green: Drive activity• Steady green: Drive is detected and has no faults2 Drive statusindicator• Off: Normal operation• Blinking amber (on 1 sec. / off 1 sec.): Drive identification is enabled• Blinking amber (on 2 sec. / off 1 sec.): Hardware/firmware fault• Steady amber: Drive is safe to removeSC4020 Storage System Drive NumberingDrives are numbered from left to right in the SC4020 storage system.The Storage Center identifies drives as XX-YY, where XX is the unit ID of the storage system, and YY is thedrive position inside the storage system.The SC4020 holds up to 24 drives, which are numbered from left to right starting from 0.Figure 14. SC4020 Storage Systems Drive Numbering24 About the SC4020 Storage System
