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