WD 1TB AV-25 5400 RPM 16MB Cache...
WD 2TB Purple 64MB AV-GP HDD 3.5" Internal
WD Purple Surveillance Hard Drives are engineered for 24x7 reliable operation, high-definition surveillance security systems that use up to 8 hard drives and up to 32 cameras. Exclusive firmware reduces error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage in security systems. Built for 24/7 surveillance AllFrame technology for better performance Designed to support up to 32 HD cameras