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Hello Wooying ,
According to Intel® Integrated Raid Module RMS25PB080 Technical Product Specification (TPS)http://www.intel.com/content/dam/support/us/en/documents/motherboards/server/sb/g37519003_rms25pb080_rms25pb040_rms25cb080_rms25cb.pdf beep codes it is normal for the newly replaced drive to short beep(1 Second on, 3 seconds off): Using hot spare in rebuild; alarm will continue during rebuild with a different sound at completion.
See the following codes:
While this process is complete the replaced Drive will show activity and thus, the server will beep and the drive will be blinking orange until the RAID is rebuilt and process completes for that newly added drive.