Western Digital WDG1SU3200N Quick Install Guide (pdf) - Page 4

LED Indicators The LED indicators function differently depending on the interface used (USB or eSATA). USB Mode The Power/Activity and Capacity Gauge LEDs are two concentric rings on the front panel of the drive. The outer ring is the Power/Activity LED and the inner ring is the Capacity Gauge LED. Power/Activity LED Appearance Steady Fast flashing (for approx. 3 seconds) Slow flashing (every 5 seconds) Rotating clockwise Description Power-on state or power-save mode Transitioning to system standby System standby Drive in use Capacity Gauge The Capacity Gauge (inner LED) consists of six sections which illuminate in a clockwise direction to indicate space used on the drive. Each section represents approximately 17 percent of disk space. Because this drive is preformatted and contains software and utilities, the first section is illuminated upon installation. The Capacity Gauge is enabled only through installation of its driver from the CD, which must be installed on each system to which My Book is connected. Capacity Gauge Activity The Capacity Gauge is updated automatically upon drive usage. In Windows, you can manually update the Capacity Gauge by right-clicking the Button Manager icon in the system tray then click outside the pop-up menu to close it. eSATA Mode In eSATA mode, both concentric rings light up when the drive is on and rotate clockwise during drive activity. Note: Capacity Gauge is not available in eSATA mode. My Book Premium ES Edition | 3