In an era where security is paramount, installing a CCTV system is one of the smartest investments you can make for your home or business. However, many users overlook a critical component: storage capacity. There is nothing more frustrating than needing to review footage only to realise it was overwritten days ago.

If you are setting up a small-scale system — specifically focusing on CCTV storage for 2 cameras — understanding how long your footage will last and what hardware you need is essential.

Understanding CCTV Storage Calculation

Calculating CCTV storage isn't just about the number of cameras — it's about the "data appetite" of your system. Several variables determine how much space a single hour of video will occupy on your hard drive.

1. Resolution

The higher the resolution, the more storage you need. A 4K (8MP) camera creates much larger files than a 1080p (2MP) camera.

2. Compression Standards (Codecs)

Modern systems use compression to shrink file sizes. H.265 (HEVC) is the current gold standard — it reduces file sizes by up to 50% vs H.264 at the same quality.

3. Bitrate

A higher bitrate = better quality but more storage. Most 1080p cameras run at 2–4 Mbps with H.265 compression.

4. Frame Rate (FPS)

Most systems record at 15 to 30 FPS. 15 FPS is sufficient for security and saves significant storage space.

Storage Requirements: CCTV Capacity Table

Storage for a 2-camera system recording 24/7 with H.265 compression:

How Many Recording Days Do You Need?

Most residential users aim for 14 to 30 days. For commercial or high-risk areas, 60 to 90 days may be required for legal or insurance compliance.

How to Extend Your Recording Days

Try these optimisations before buying a bigger drive:

Choosing the Recommended CCTV Hard Disk

Standard PC drives run 8 hours/day, 5 days/week. A CCTV DVR runs 24/7 — a desktop HDD will fail within 6–12 months.

Best HDD Size for a 2-Camera Setup

🛒 Shop CCTV Hard Disks at WeKart

❓ Frequently Asked Questions

How much storage do I need for 2 CCTV cameras?+

For 2 cameras at 1080p, 15 FPS, 24x7 with H.265 — ~40 GB/day = 1.2 TB for 30 days. Buy a 2TB surveillance HDD for buffer.

Can I use a normal desktop HDD in my CCTV DVR?+

No. Desktop HDDs will fail within 6 to 12 months in a 24x7 DVR. Always use surveillance-grade HDDs like D25, Seagate SkyHawk, or WD Purple.

How many days will a 1TB HDD last for 2 cameras?+

With 2 cameras at 1080p, 15 FPS, H.265, 24x7 — a 1TB HDD lasts 20 to 25 days. For 30 days backup, opt for a 2TB HDD.

What is H.265 and why does it save storage?+

H.265 (HEVC) reduces file sizes by up to 50% vs H.264 at the same quality. H.265+ saves up to 75% — store double footage on same drive.

Do I need to format the HDD after installing in my DVR?+

Yes — mandatory. Go to DVR Menu → Storage → HDD Management → Format. Do NOT format on PC — DVR must initialise it in its own format.

Which is better for 2 cameras — 1TB or 2TB?+

2TB is better. 1TB = ~20 days, 2TB = 40+ days for 2-camera 1080p. Minimal price difference, much more peace of mind.

Will a CCTV HDD work in a desktop computer?+

Yes — standard 3.5-inch SATA drives work in PCs. But they are optimised for continuous sequential writing (CCTV) rather than random PC tasks.