NEC HX4500 Service & Reference Manual page 130

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Electrostatic discharge (ESD) can damage components; place them
on an antistatic surface. Update the CPU baseboard using an
antistatic wrist strap attached to chassis ground. Observe static
precautions. Use an antistatic wrist strap.
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Installing a Hard Disk Drive Cage
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Note:
drive cage. If a hard drive cage is added to this server, you must add
an additional controller board (either SCSI or RAID).
Note:
supply. If a hard drive cage is added to this server, you must add an
additional power supply.
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4-58 Assembly and Disassembly Procedures
! CAUTION
The HX4100 server can be purchased with a single hard
The HX4100 server can be purchased with a single power