HDD Recognition Error

Error code:

HDD cannot be recognized (Each error code is the number for analysis)
Failed to access the Mirroring HDD(A) (Each error code is the number for analysis)
Failed to access the Mirroring HDD(A) (Each error code is the number for analysis)

Step	Confirmation and action	YES	NO
1	Check the cable status of HDD unit Are there any scratches or breaks in the cable?	Go to step 2	Replacement of HDD cable.
2	Check the HDD unit connection Reconnect the connectors on the HDD unit and the main board and reboot to recover?	Go to step 3	End
3	Replace the HDD unit Does the error still occurs?	Replace the Main Board (Non-Mirroring) Go to step4 (Mirroring)	End
４	Replace the RAID Board Unit (Mirroring) Does the error still occurs?	Replace the Main Board (Mirroring)	End (Mirroring)

# HDD Recognition Error