0010-08667-01 Avid VideoRAID RTR320 - 1TB usable 0010-08668-01 Avid VideoRAID RTR320 - 2TB usable 0010-08721-01 Avid VideoRAID RTR320X - half populated 1TB usable 0010-08669-01 Avid VideoRAID RTR320X - 2TB usable 0010-08722-01 Avid VideoRAID RTR320X - half populated 2TB usable 0010-08670-01 Avid VideoRAID RTR320X - 4TB usable