Hitachi HF-BX1000 Instruction Manual page 18

SAFETY INSTRUCTIONS (Continued)
 As a replacement HDD, do not use an HDD previously used. If you do, this
equipment may not operate properly or the data on the HDDs may be lost
because of configuration information mismatches, or other reasons.
 Do not replace the two HDDs at the same time. If you do, the data gets
corrupted.
 Do not use a replaceable component for longer than the recommended
replacement cycle. If you do, a deteriorating or worn-out component may
cause the equipment to fail.
S-15
(See page 8-12.)
(See page A-1.)