HP P400 Expand Failing

[Matty]

Hi Everyone,
Im trying to expand an array however recieving this message:
  This operation is not supported with the current configuration. Use the  "show" command on devices to show additional details about the  configuration.

The card does have a 512MB BBWC installed and is showen as enabled.
This is a print out of the config

Smart Array P400 in Slot 9
   Bus Interface: PCI
   Slot: 9
   Serial Number: PA5360DBFTCJ4M
   Cache Serial Number: PA2270H9SV270E
   RAID 6 (ADG) Status: Enabled
   Controller Status: OK
   Hardware Revision: Rev B
   Firmware Version: 7.22
   Rebuild Priority: High
   Expand Priority: High
   Surface Scan Delay: 3 secs
   Surface Scan Mode: Idle
   Wait for Cache Room: Disabled
   Surface Analysis Inconsistency Notification: Disabled
   Post Prompt Timeout: 15 secs
   Cache Board Present: True
   Cache Status: OK
   Accelerator Ratio: 25% Read / 75% Write
   Drive Write Cache: Enabled
   Total Cache Size: 512 MB
   No-Battery Write Cache: Disabled
   Cache Backup Power Source: Batteries
   Battery/Capacitor Count: 1
   Battery/Capacitor Status: OK
   SATA NCQ Supported: False

   Array: A
      Interface Type: SATA
      Unused Space: 0 MB
      Status: OK

      Logical Drive: 1
         Size: 4.5 TB
         Fault Tolerance: RAID 5
         Heads: 255
         Sectors Per Track: 32
         Cylinders: 65535
         Strip Size: 512 KB
         Status: OK
         Array Accelerator: Enabled
         Parity Initialization Status: Initialization Completed
         Unique Identifier: 600508B1001044424654434A344D0008
         Disk Name: \\.\PhysicalDrive4
         Mount Points: D:\ 4.5 TB
         Logical Drive Label: AE6AB4EDPA5360DBFTCJ4M84CF

      physicaldrive 1I:0:3
         Port: 1I
         Box: 0
         Bay: 3
         Status: OK
         Drive Type: Data Drive
         Interface Type: SATA
         Size: 1 TB
         Firmware Revision: 1AA01113
         Serial Number: S1LMJDWS403981
         Model: ATA     SAMSUNG HD103UI
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 31
         Maximum Temperature (C): 62
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

      physicaldrive 1I:0:4
         Port: 1I
         Box: 0
         Bay: 4
         Status: OK
         Drive Type: Data Drive
         Interface Type: SATA
         Size: 1 TB
         Firmware Revision: CC32
         Serial Number:             6VX0K28L
         Model: ATA     ST31000520AS
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 36
         Maximum Temperature (C): 49
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

      physicaldrive 2I:0:5
         Port: 2I
         Box: 0
         Bay: 5
         Status: OK
         Drive Type: Data Drive
         Interface Type: SATA
         Size: 1 TB
         Firmware Revision: CC32
         Serial Number:             6VX0HKKG
         Model: ATA     ST31000520AS
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 37
         Maximum Temperature (C): 49
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

      physicaldrive 2I:0:6
         Port: 2I
         Box: 0
         Bay: 6
         Status: OK
         Drive Type: Data Drive
         Interface Type: SATA
         Size: 1 TB
         Firmware Revision: CC32
         Serial Number:             6VX0KBJL
         Model: ATA     ST31000520AS
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 36
         Maximum Temperature (C): 50
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

      physicaldrive 2I:0:7
         Port: 2I
         Box: 0
         Bay: 7
         Status: OK
         Drive Type: Data Drive
         Interface Type: SATA
         Size: 1 TB
         Firmware Revision: CC32
         Serial Number:             6VX0K4G3
         Model: ATA     ST31000520AS
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 37
         Maximum Temperature (C): 50
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

      physicaldrive 2I:0:8
         Port: 2I
         Box: 0
         Bay: 8
         Status: OK
         Drive Type: Data Drive
         Interface Type: SATA
         Size: 1 TB
         Firmware Revision: SN05
         Serial Number:             9QJ2QKDG
         Model: ATA     ST31000340NS
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 41
         Maximum Temperature (C): 54
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

   unassigned

      physicaldrive 1I:0:2
         Port: 1I
         Box: 0
         Bay: 2
         Status: OK
         Drive Type: Unassigned Drive
         Interface Type: SATA
         Size: 1000.2 GB
         Firmware Revision: 01.01A01
         Serial Number:      WD-WCAU44041547
         Model: ATA     WDC WD10EACS-00D
         SATA NCQ Capable: True
         SATA NCQ Enabled: True
         Current Temperature (C): 35
         Maximum Temperature (C): 67
         PHY Count: 1
         PHY Transfer Rate: 1.5GBPS

Any help would be great.
Thanks