Using the Front Panel for Operations22Install the HDD unit provided (page 23).The HDDs can be easily installed or removed from the HDD bay slots inside the front cover.Contact your dealer for information on purchasing, installing, and replacing HDDs.Handling the HDDImportant:• Hard disk drives are precise devices. Note the following precautions when handling them.⋅ Do not subject them to vibration or impact.⋅ Before touching an HDD, ground yourself against a metal object to eliminate any static electricity. Always hold the HDDs by the sideswhen carrying them.⋅ To prevent damage to components from static electricity, do not touch the parts or connectors on top of the HDDs.• Contact your dealer for information on compatible HDDs.Operation is only guaranteed with recommended HDDs.• All the HDDs must be the same model.Even if the capacity is the same, the space may be smaller by a few percent if the HDD models are different.• Always install the HDDs in order starting with HDD 1.(Disk slots in order from 1 to 9, starting on the left)• In RAID5 or RAID6 modes, do not change the position of the HDD after starting operation.Recorded data may not be read correctly if they are changed.Item Reference PageInstallation For individual HDD units Installing HDDs page 23For extension units Installing HDDs by unit page 24Remove For individual HDD units Removing HDDs page 25For extension units Removing HDDs by unit page 27Mode setting All units Setting the HDD's Operation Mode page 28Replacement &recoveryIn single mode Installing HDDsRemoving HDDspage 23page 25In RAID modeError RecoveryHDD error recovery(In RAID mode)page 29