Description
A computer disk and a surveillance disk do not do the same job. The computer’s writes in bursts and rests; a recorder’s writes twenty-four hours a day, every day of the year, with four or eight cameras pouring video into it at once. Putting a desktop drive in a recorder is the number one reason a camera system turns up one day with the recording cut short.
This is a Western Digital WD20PURX from the Purple range, the line the manufacturer designs specifically for video surveillance: 2 TB, 3.5″ format and a SATA 6 Gb/s interface. Drives in that range declare 24/7 operation, a workload of up to 180 TB per year and AllFrame firmware, designed to reduce dropped frames when several cameras write in parallel — exactly when an ordinary drive starts to fail.
How we install it. The disk goes inside the recorder, screwed into its bay and connected with the SATA data and power cables, and is then formatted from the recorder itself — not from a computer — so it ends up with the right file system. That is also where we set retention: how many days are kept, and which cameras record continuously versus only on events, which is what makes 2 TB stretch or vanish in a week. It can be bought on its own or already fitted in the recorder.
Recorders that take it are under Dahua NVR recorders and the 4-channel Hikvision NVR. Other capacities are under hard drives.
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