Hitachi HF-BX1000 Instruction Manual page 16

SAFETY INSTRUCTIONS (Continued)
 Although this equipment featuring RAID1 is more reliable than general
systems, it is still prone to the loss of data in the HDDs. Not only a machine
failure but also an unexpected power failure or an operation error may cause
data to be lost for good. To prevent such loss of data, implement scheduled
data backup in daily operation. Also, protect the power source from
undesirable interruptions by such means as UPS.
 This equipment is evaluated based on the specific HDD models authorized
by us. Replace only with specific HDD models authorized by us. Otherwise,
the existing data in the HDD may be lost. Also, always observe the
recommended replacement interval for HDDs (See "APPENDIX
HANDLING REPLACEABLE COMPONENTS").
 Since each equipment has its own RAID1 configuration information (e.g.,
serial number), you cannot swap HDDs even between two units of this
equipment. If you replace an HDD, the replaced HDD is recognized as
unmatched with RAID1 configuration information and, as a result, RAID1
reconfiguration starts automatically by the RAID1 reconfiguration function.
As a result, all the data in the replaced HDD is deleted. If you are using more
than one HDD, be careful in handing and storing them so that you do not
mistake one from another.
 This equipment manages a serial number unique to each HDD as RAID1
configuration information. Therefore, if you copy an HDD using any
function other than the RAID1 reconfiguration function, the HDD is
recognized as an invalid medium, so the equipment does not start even if you
install the HDD in a drive bay.
 Maintenance of a RAID1 system requires a high level of expertise. Should
any mistakes be made during the work, the data stored on the HDDs may be
lost.
 When a RAID1 system is newly built, the RAID1 configuration information
is recorded on the HDDs. An HDD with configuration information recorded
cannot be used in any other equipment. If you are using more than one HDD,
be careful in handing and storing them so that you do not mistake one from
another. If HDDs are mixed up, a RAID1 configuration information
mismatch occurs. The equipment may not operate properly, and the data on
the HDDs may be lost.
 When you build a RAID1 system from scratch, prepare two new HDDs
selected from the models specified and tested by HITACHI. Otherwise, the
data stored on the HDDs may be lost.
S-13
(See page 8-1.)
(See page 8-2.)