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Failed to create RAID logical drive WAE-7371-k9

hi all  we have cisco wae-7371-k9 , we wanna recreate RAID device using cd recovery. we booting on cd, and when we done with option numbers 2,3,5 succes but when we came on option 7, we cannot recreate RAID, it failed, following the log: Installer Main Menu:     1. Configure Network     2. Manufacture flash (done)     3. Install flash cookie     4. Install flash image from network     5. Install flash image from cdrom     6. Install flash image from disk     7. Recreate RAID device (WAE-674/7341/7371 only)     8. Wipe out disks and install .bin image     9. Exit (Eject and reboot) Choice [0]: 7 Recreate RAID device option is selected   All disk data will be lost.   Are you sure you want to recreate RAID array? [n]: y Saving random seed... dd: opening `/state/random-seed': No such file or directory   No volume groups found Controllers found: 1  All data in logical drive 1 will be lost. Deleting: logical drive 1 ("")  Command completed successfully. Controllers found: 1  A selected physical drive is not available for use.  Command aborted. Failed to create RAID Logical drive. (1,2)     MODEL: OE7371    FLASH: found, directory validated   COOKIE: valid    IMAGE: FLASHDEV: /dev/sda  what's wrong with wae ?if we run command show disk detail, all hard disk detected    NO-HOSTNAME# sh disk det  RAID Physical disk information:   disk00: Ready                      JTX1470L    286102 MB   disk01: Ready                      JTX1B24L    286102 MB   disk02: Ready                      JTX1B9SL    286102 MB   disk04: Ready                      JTWSEBWL    286102 MB   disk05: Ready                      JTX0VYRL    286102 MB  RAID Logical drive information:  Mounted file systems:  MOUNT POINT      TYPE       DEVICE                SIZE     INUSE      FREE USE%  Disk encryption feature is disabled.  can you help, what's the problem .?