Category overview
About AV Hard Disk
Buy CCTV Hard Disks for DVR and NVR Recording
A CCTV hard disk stores recorded footage from a compatible DVR or NVR. Browse available 500GB, 1TB, 2TB and 4TB SATA drives, then choose capacity based on camera count, bitrate, resolution, recording schedule and required retention period.
This category may include both brand-new and refurbished drives. The condition is stated in the individual product title and description; check it carefully along with capacity, interface, warranty information and recorder compatibility before ordering.
How Much CCTV Storage Do You Need?
Retention cannot be determined from capacity alone. It changes with the number of cameras, recording bitrate, codec, frame rate, audio, scene activity and whether the recorder uses continuous, scheduled or event-based recording. Use our CCTV hard-disk storage-days guide for an estimate.
500GB: may suit a small system or shorter retention requirement, depending on settings.
1TB and 2TB: commonly considered as camera count, resolution or retention increases.
4TB: can provide longer retention, subject to the recorder’s supported capacity.
These are planning categories, not guaranteed retention periods. Check the recorder’s bitrate and storage calculator with the actual configuration.
Check DVR or NVR Compatibility
Confirm the number of SATA bays and maximum supported capacity per drive on the exact CCTV DVR or IP NVR. Some recorders require specific drive sizes, firmware or initialization procedures. Back up any important footage before replacing an existing disk.
A surveillance recording system can overwrite the oldest footage when storage becomes full, depending on its configuration. After installation, verify disk health, recording status, system time and playback on every camera channel.
New vs Refurbished CCTV Hard Disk
A new and a refurbished drive may differ in previous use, warranty terms and price. Review the exact listing and select according to the site’s reliability requirement and budget. For critical evidence retention, consider redundancy, health monitoring and an independent export or backup workflow where supported.
Hard-disk installation should be done with the recorder powered down and handled using appropriate anti-static precautions. Ensure adequate recorder ventilation because heat can affect drive reliability.
