Step 1:

After logging into the Disk Station Manager - a warning prompt will be displayed that a Volume is in degraded mode.

Step 2:

• Proceed to Storage -> Volume
• Click on Beep Off to disable the warning beeper

Step 3:

• Click on 'Get Info to learn more about the degraded error of the RAID Volume

Step 4:

• After clicking on the Disk Tab, identify which disk has experienced a failure. In this example - disk five has failed.
• To replace the disk, please refer to the Hardware Assembly Guide

Step 5:

• After replacing the defective disk, proceed back to the Volume Manager and click on the repair button

Step 6:

• Here, the Volume Repair Wizard has started.
• Proceed by clicking on the Next Button

Step 7:

• Proceed by selecting the new replacement disk which was just installed.

Step 8:

• Acknowledge the standard warning that all data on the selected disk will be lost, as it will be used to repair the volume of the Synology Disk Station

Step 9:

• The final confirmation settings are displayed.

Step 10:

• Click on finish to close the wizard, and the Disk Station Manager will start repairing the volume.

Step 11

• Here is the repair sequence (consistency check) in progress. When the repair is completed, the Volume will return to Normal Status