Set up RAID on Buffalo Two-Drive LinkStation or TeraStation NAS - YouTube
Amazon.com: Buffalo 2 TB Spare Replacement Hard Drive for DriveStation Quad, LinkStation Pro Quad and TeraStation (OP-HD2.0T/4K-3Y): Computers & Accessories
LinkStation 400 User Manual
A hard disk drive error is shown on the NAS. What should I do? | Qnap Advanced Support