NEC HX4500 Service & Reference Manual page 115

Hot-Swapping a Hard Drive
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(steady yellow light), you can remove the drive and swap in a
replacement at any time when the drive is not being accessed,
without needing to power down the system. However, drive
manufacturers caution against moving a drive that is still spinning
because of possible damage to the drive.
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spinning when you remove it. Follow the next step exactly when
removing drives.
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When the SCSI drive fault LED indicates a drive fault
Depending on the drive fault, the drive may be still
Observe static precautions. Use an antistatic wrist strap.
Assembly and Disassembly Procedures 4-43