Also, if you intend to use flexraid for 'separate drives', this still won't work if want to try to add/remove the drives 'for backup'. The device is designed to keep drives in it until they either fail or are upgraded. Once you pull a drive, its marked as failed and you will not be able to re-add it without it getting formatted.
nv+ ~ 1gb ram ~ 4x WDC WD20EARS-00S8B1 ~ 5555 GB
ultra4 ~ 4 gb ram ~ 2x ST31500341AS ~ 2x ST4000DX000-1C5160 ~ 6471 GB
pro business ~ 4gb ram ~ dual redundancy ~ 4x Hitachi HDS724040ALE640 ~ 2x SAMSUNG HD204UI ~ 9130 GB
A/V streaming ---> Subsonic
---> EVO 3D