🔵 Exact Definition of the Hard Drive Item | Specification Company | WESTERN DIGITAL (WD) Series | WD PURPLE Usage Type | SURVEILLANCE / CCTV / DVR / NVR Model | WD60PURZ Full MDL shown in the picture | WD60PURZ-85ZUFY1 Nominal Capacity | 6 TB Capacity after formatting | Approximately 5.45 TIB Storage Type | Mechanical HDD Physical Size | 3.5 inches Interface | SATA III / SATA 6 GB/S CACHE | 64 MB Rotation Speed | 5400 RPM Advertised Internal Transfer Speed | Up to 175 MB/S Recording Technology | CMR Operation | 24/7 Supported Camera Count | Up to 64 cameras Dedicated Use | DVR/NVR Surveillance Systems ALLFRAME 4K | Yes INTELLISEEK | Yes TLER | Yes ADVANCED FORMAT | Yes 6TB and 5400RPM and 64MB and SATA 6GB/S and internal speed up to 175MB/S. Number: MDL: WD60PURZ-85ZUFY1 This specifies the VARIANT / REVISION of the drive. S/N: WX81DB8FVEC7 This is the specific serial number for this drive. The drive was manufactured on January 19, 2019. MADE IN THAILAND Performance This is not a regular DESKTOP hard drive. WD PURPLE is specifically designed for continuous writing from surveillance cameras. The published specifications for the WD60PURZ are: 5400 RPM 64 MB CACHE 175 MB/S INTERNAL DATA RATE SATA 6 GB/S maximum interface speed. And here is a very important point: SATA 6 GB/S ≠ 600 MB/S Hard Drive Speed The 6 GB/S is the theoretical SATA interface speed, not the speed of the mechanical drive. In reality, this drive can reach about 175 MB/S in sequential transfer under suitable conditions. Why is it labeled WD PURPLE? The WD PURPLE series is aimed at video surveillance. WD PURPLE™ SURVEILLANCE HARD DRIVE And it states: DESIGNED FOR 24 × 7 SYSTEMS ALLFRAME 4K SUPPORTS UP TO 64 CAMERAS ENHANCED WORKLOAD RATING This means its design focuses on receiving continuous video streams from a large number of cameras, rather than focusing on desktop computer or gaming performance. Product specifications indicate a workload rating of up to 180 TB per year and support for up to 64 cameras. 📐 Dimensions and Weight WD60PURZ Specifications: Length: 147 MM Width: 101.6 MM 🌡 Reliability The published specifications include: NON-RECOVERABLE READ ERRORS: 1 IN 1014 This is an unrecoverable read error rate of 1 per 1014 bits read. The advertised head load/unload cycles (LOAD/UNLOAD) reach: 300,000 cycles. 🔧 A Very Important Point About the Speed of This Version SMART data/specific tests for this version were found: WDC WD60PURZ-85ZUFY1 This shows some actual readings for this variant, including a measured rotation speed of about 5700 RPM, with different maximum read results depending on the test. However, the official commercial specification for this model is 5400 RPM, so we should not say the drive is "5700 RPM" instead of 5400. The 5700 number is a reading from some identification/SMART tools, while the marketing specification for WD60PURZ is 5400 RPM.