Introduction
The hard drive inside your NVR works harder than almost any other drive in your organisation—writing data 24 hours a day, 7 days a week. Using the wrong drive leads to premature failure, lost footage, and unexpected replacement costs. Here is how to choose the right one.
Surveillance-Rated vs Desktop Drives
Desktop drives (WD Blue, Seagate Barracuda) are designed for 8–10 hours of daily use. Surveillance drives (WD Purple, Seagate SkyHawk) are engineered for 24/7 operation, handle multiple simultaneous write streams, and use firmware optimised for sequential video recording.
Capacity Planning
Calculate your daily storage consumption based on camera count, resolution, codec, and frame rate. Multiply by your desired retention period (typically 15–30 days). Add 10–15% overhead. This gives you the minimum drive capacity needed.
Drive Reliability
Surveillance drives are rated for 180–300 TB per year of data written (TBW), compared to 55 TB/year for desktop drives. They also support a higher number of simultaneous camera streams (up to 64 for WD Purple, 64 for SkyHawk) without dropped frames.
When to Replace
Monitor drive health through the NVR’s SMART status. Replace drives proactively at 3–4 years of continuous use, or immediately if SMART reports bad sectors, reallocated sectors, or temperature warnings. Keep a spare drive on hand for rapid replacement.
FastEgy Recommendation
FastEgy supplies WD Purple surveillance drives in 1 TB, 2 TB, 4 TB, 6 TB, and 8 TB capacities. We install and configure drives with every NVR purchase. Contact us for HDD sizing assistance and competitive pricing.
About FastEgy
FastEgy is a leading distributor of Hikvision, EZVIZ, and professional security solutions across Egypt. Visit fastegy.net or call us for expert consultation on your next surveillance project.