ライトバックキャッシュが強制的に無効になり、キャッシュバックアップデバイスのステータスが不明になりました

環境

E2700

問題

• EML レポート Write-back caching forcibly disabled。
• キャッシュバックアップデバイスのステータスは UNKNOWNです。

         Cache Backup Device
           Status:                    UNKNOWN
            Type:                      USB flash drive
            Location:                  Controller A, Connector USB 2
            Capacity:                  3,072 MB
            Product ID:                Ext Hard Disk
            Part number:               Not Available
            Serial number:             xxxxxxxxx
            Revision level:            0000
            Manufacturer:              OEM
            Date of manufacture:       Not available
            Status:                    UNKNOWN
            Type:                      USB flash drive
            Location:                  Controller A, Connector USB 1
            Capacity:                  3,072 MB
            Product ID:                Ext Hard Disk
            Part number:               Not Available
            Serial number:             xxxxxxxxx
            Revision level:            0000
            Manufacturer:              OEM
            Date of manufacture:       Not available