When using RAID1 (mirroring) or RAID 5/6, you can replace any single hard drive without losing any of your data. Your data remains available and online during the entire process.
To hot swap a disk
The Main > Dashboard page appears.
Overview
Workflow
Setting Up Storage Using the Storage Setup Wizard
Manually Setting Up Storage
Working with iSCSI Targets
Installing a SATA Hard Drive
Safely Removing Hard Drives
Enlarging a RAID1 Array