Every recorder writes to a hard drive, and the drive is the hardest-working part of the whole system: writing multiple video streams continuously, 24 hours a day, for years. That duty cycle is why surveillance-grade drives (WD Purple, Seagate SkyHawk, Toshiba S300) exist — firmware tuned for continuous video workloads and rated for the vibration of multi-drive enclosures. A desktop drive in a recorder is the single most common corner cut in cheap installations, and the most common reason footage is missing the day it matters.
Sizing is a retention calculation, not guesswork: camera count × resolution × frame rate × recording hours × days of retention. We size drives so you keep the number of days you actually need — insurance claims and criminal cases routinely need footage from more than a week ago.
Drives are consumables. In a system that records continuously, expect to budget for replacement roughly every three to five years — ideally on your schedule, before the drive chooses its own moment.
Brands we fit and service
The surveillance hard drive market splits into hardware built for South African conditions and lookalikes that fail at the first hard season. These are the manufacturers we trust on our installations:
- Western Digital Purple
- Seagate SkyHawk
- Toshiba S300
See our brand guides for how these manufacturers compare.
When the surveillance hard drive goes wrong
These are the failures we're called to most often — each with its symptoms, causes and our fix on the dedicated problems page:
- Hard drive failureHDD Error — Clicking or grinding sounds, "HDD Error" warnings, recordings with corrupt or missing segments, or a recorder that hangs…
- Footage overwritten too quickly — The event you need has already been recorded over — retention is only a few days.
- Insufficient storage — Adding cameras or moving to 4K collapsed your retention; the recorder warns about capacity.
- Corrupted recordings — Playback stutters, blocks of grey artefacts, files that refuse to export or open.
Need this fixed or installed?
Our CCTV Hard Drive Replacement service covers surveillance hard drive work — quoted upfront and backed by our 12-month workmanship warranty.