For The Error - Contec EPC-2020 Series User Manual

6. Software RAID setup

For the error

If an error occurs in a RAID drive or a HDD, you can check the status of the Array, the
mirroring-configured RAID drive, and the HDD using Rapid storage technology. Each status can be
checked through the "Status" or "Management" of Rapid storage technology.
Status
※One mirroring-configured HDD is not connected.
Management
※One mirroring-configured HDD is not connected.
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EPC-2020 Series User's manual