Hitachi HF-W2000 Instruction Manual page 22

SAFETY INSTRUCTIONS (Continued)
 A recovery DVD contains an image file created for the hardware
configuration at the factory shipment. If the hardware configuration has
changed from the one at the factory, the OS may not start after restoration
work. Remove all external storage devices to resume the hardware
configuration at the factory shipment before you perform restoration work
using a recovery DVD.
When a recovery DVD is used, all data in the system drive is deleted. Back
up the data beforehand as required.
 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
the Manufacturer. Replace only with specific HDD models authorized by the
Manufacturer. Otherwise, the existing data in the HDD may be lost.
Also, always observe the recommended replacement interval for HDDs (Refer to
"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 dare, the stored data in the newly installed HDD will be erased with
automatic RAID1 rebuilding process due to inconsistency of the RAID1
configuration information. If you own multiple units of this Equipment, manage
use and inventory of HDDs so that they are not inadvertently mixed.
 As a replacement HDD, do not use an HDD previously used in the A model
or the B model. 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.
 Use a brand-new HDD (an unused HDD) or an HDD to which "Initialize Drives"
has been applied (see "10.6.7 "Initialize Drives") as a replacement HDD.
 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 HDD1 and HDD2 are installed, their capacities must be the same.
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