D-link Dir-857 (media router)

I am trying to find out details on the CPU in this router, having no luck, hoping someone can help. I am dying to order it because it supports USB 3.0 and a disk can be attached and it will act a NAS device. I was also planning to add at least two other IP attached disks "WD Live" drives. So it could be 3x2TB drives, want to make sure the processor can cope with this. Thanks,