Why is the Hard Drive Light-Bar Red?
Originally posted on the HP EX48x Support Pages 
- That a hard drive has failed and must be replaced.
Additionally, the connected computers show the following:
- The drive was removed from the drive bay before removing it from total storage. See Removing a hard drive in the Windows Home Server Console Help.
- Red icon on the task tray.
- Red indicator on the Windows Home Server Console Network Health tab.