Drive 12 on RS2416RP+ is damaged and in critical status. Back up your data immediately and then replace the drive.

Drive information
Brand: Seagate
Model: ST4000DM000-1F2168
Capacity: 3.6 TB
Serial number: Z301BTAQ
Firmware: CC52

S.M.A.R.T. Status: Critical
Drive reconnection count: 12
Drive re-identification count: 0

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