Western Digital WD11PURZ WD Purple 1TB 3.5' Surveillance HDD 5400RPM 64MB SATA3 110MB/s 3yrs limited warranty Uncompromising Storage with a WD Purple Surveillance Hard Drive WD Purple™ drives are engineered specifically for surveillance to help withstand the elevated heat fluctuations and equipment vibrations within NVR environments. An average desktop drive is built to run for only short intervals, not the harsh 24/7 always-on environment of a high-definition surveillance system. With WD Purple, you get reliable, surveillance-class storage that’s tested for compatibility in a wide range of security systems, and some of our latest models (WD22PURZ, WD42PURZ, and WD63PURZ) have improved power efficiency. Exclusive AllFrame™ technology helps reduce frame loss and improve overall video playback. Full Specifications Features Engineered for mainstream surveillance systems WD AllFrame technology delivers optimizations for write-intensive, low bit-rate, high stream-count workloads typical to mainstream surveillance applications Supports up to 180TB/yr workload rate and up to 16 bays Capacity 1TB Form Factor 3.5-Inch Connector SATA Compatibility Up to 64 HD cameras/ Up to 16 drive bays/ AllFrame firmware technology Interface SATA Transfer Rate up to 110MB/s Disk Speed (RPM) 5400 RPM Recording Technology CMR Cache Size 64MB Warranty 3-Year Limited Warranty Dimensions (L x W x H) 147mm x 101.6mm x 26.1mm Weight 0.99lbs Operating Temperature 0°C to 65°C Non-Operating Temperature -40°C to 70°C Certifications BSMI, ICES-003/NMB-003, CE, FCC, KC, Maghreb, RCM, UKCA, VCCI, CB-Scheme, TUV, UL More info: https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-purple-hdd/product-brief-wd-purple-hdd.pdf