Chapter 3: System Interface
3-3
Power: Indicates power is being supplied to the system's power
supply units. This LED should normally be illuminated when the system is
operating.
3-4 Serial ATA Drive Carrier LED
Each Serial ATA drive carrier has a green LED. When illuminated, this
green LED (on the front of the Serial ATA drive carrier) indicates drive
activity. A connection to the Serial ATA backplane enables this LED to blink
on and off when that particular drive is being accessed.