Thanks for support, money is not that issue to talk at the moment bt before i buy HDD i need some clarification i heard have some few types: WD ENT. Full performance, Black label, green label & blue label. Can tell me whc is the most powerfull for CCTV video recording with RAID 5 configuration on serverware with 4TB storage? Some of the HDD not suitable for video streaming & for video recording that what i hear from other engineers. Pls kindly explain/share your experince & knowledge, thank you.