The UK edition

Western Digital Purple internal hard drive 1 TB 5400 RPM 64 MB 3.5" Serial ATA III

£137.99

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1 TB 3.5" 5400 RPM Serial ATA III. Surveillance system HDD. Storage drive buffer size: 64 MB. 6 Gbit/s. Uncorrectable Bit Error Rate (UBER): < 1 per 10^14 bits read. 449 g. Uncompromising Surveillance Storage. WD Purple drives are designed to meet the challenges of 24x7 video surveillance recording. These 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 drives, you get reliable, surveillance-class storage that’s tested for compat