Don`t need reboot system to active new HDD.
My hardware is HP DL380G6.
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1.HP Array Configuration Utility
(1)Download HP Array Configuration Utility, and install
(2)Run HP Array Configuration Utility
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2.Open Array Configuration Utility
(1)Select an available device, choose your raid card
(2)Systems And Devices, choose uninstall HDD
A.Creating Raid
B.Creating Logical
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3.Administration Tool
(1)Open Disk Management
(2)Find a HDD
A.Config HDD, not set to dynamic Disk
B.Format NTFS