Seagate 2TB 64MB Cache 7200RPM SATA2 3.0Gb/s (Heavy-Duty) Internal Desktop 3.5" Hard Drive -NAS/RAID/PC/DVR Seagate Desktop Hard Disk Drive Enterprise or Constellation Desktop Drive 64MB Cache SATA2 3.0GB /s For RAID/NAS/CCTV/DVR PC/Mac