FreeNas e compartilhamentos

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FreeNAS-i386-0.7.2.8191

kernel: GEOM: ad6:the secundary GPT table is corrupt or invalid

Configurei em RAID por Software , Raid 1, 2 discos do mesmo tamanho - Raid mirror ou espelho, um disco é a cópia do outro...
Aparece sempre esse erro ao desligar ou a reiniciar o FreeNas!!!

Info dos erros: (Do virtual box, mas numa maquina real acontece o mesmo)

Oct 26 23:19:58 freenas kernel: ipfw2 (+ipv6) initialized, divert loadable, nat loadable, rule-based forwarding disabled, default to accept, logging limited to 5 packets/entry by default
Oct 26 23:19:58 freenas kernel: acd0: DVDROM <VBOX CD-ROM/1.0> at ata1-master UDMA33
Oct 26 23:19:58 freenas kernel: ad4: 1536MB <VBOX HARDDISK 1.0> at ata2-master SATA300
Oct 26 23:19:58 freenas kernel: ad6: 2048MB <VBOX HARDDISK 1.0> at ata3-master SATA300
Oct 26 23:19:58 freenas kernel: ad8: 2048MB <VBOX HARDDISK 1.0> at ata4-master SATA300
[b][b]Oct 26 23:19:58 freenas kernel: GEOM: ad6: the secondary GPT table is corrupt or invalid.
Oct 26 23:19:58 freenas kernel: GEOM: ad6: using the primary only -- recovery suggested.
Oct 26 23:19:58 freenas kernel: GEOM: ad8: the secondary GPT table is corrupt or invalid.
Oct 26 23:19:58 freenas kernel: GEOM: ad8: using the primary only -- recovery suggested.[/b][/b]
Oct 26 23:19:58 freenas kernel: Trying to mount root from ufs:/dev/ad4s1a
Oct 26 23:19:58 freenas kernel: GEOM_MIRROR: Device mirror/Raid launched (2/2).

Ao fazer a configuração no FreeNas (adicionar discos, formatar, montar os discos etc) da me a informação de estar tudo ok mas sempre que o desligo ou reinicio da me este erro!!!
Estarei a fazer algo errado??? Uma ajudinha vinha a calhar...

Obrigado