Japanese user's guide for the Sonnet Fusion R400Q 4-drive Serial ATA rack mount storage system with quad interface. These directions apply to storage systems with drives.
When connected via FireWire, FireWire800, or USB, there must be a drive in the first bay (top bay of Fusion D400Q; left bay of Fusion R400Q); otherwise, the hard drives in the other drive bays will not be recognized. If hard drive is connected via SATA, there is no issue.