Hard Drives for CCTV

CCTV hard drives are surveillance-grade drives designed specifically for the continuous 24/7 write load of multi-camera recording — significantly different from desktop drives, which are designed for moderate read-heavy use and fail prematurely under continuous CCTV write loads. The two dominant surveillance brands are Seagate SkyHawk and Western Digital Purple, both rated for 24/7 operation, optimised for video write patterns, and warranted for surveillance use. Sizing is straightforward: total camera bitrate × retention period = required capacity, with practical numbers landing at roughly 2 TB per 4MP camera for 30 days continuous recording at H.265+. Sizes from 1 TB suit single-camera installs through 24 TB for large multi-camera NVRs and RAID configurations.

Security Cameras Australia stocks surveillance-grade drives from Seagate SkyHawk, Seagate SkyHawk AI (for installs running on-NVR analytics), and Western Digital Purple. Every drive is genuine Australian stock with full manufacturer warranty.

For NVR selection see NVRs; for DVR see DVRs.

Why surveillance-grade matters

Surveillance drives differ from desktop drives in ways that affect CCTV reliability:

24/7 continuous-operation rating. Desktop drives are designed for ~8 hours/day moderate use. Surveillance drives run 24/7 continuously. Using a desktop drive in an NVR typically produces failure within 1-3 years; surveillance drives last 3-5+ years.
Write-optimised firmware. CCTV is write-heavy (cameras continuously recording) with occasional reads (playback). Desktop firmware optimises for read-heavy mixed use; surveillance firmware optimises for sustained write throughput.
Multi-camera workload tuning. Surveillance drives handle the simultaneous-write workload of multiple camera streams better than desktop drives, which can stutter under high concurrent write load.
Vibration tolerance. NVRs often have multiple drives in close proximity; surveillance drives include rotational vibration sensors to maintain throughput under multi-drive vibration. Desktop drives don't.
Workload rating. Surveillance drives are rated for higher annual workload (typically 180 TB/year) vs desktop (typically 55 TB/year). For multi-camera installs, desktop drives exceed their workload rating quickly.

How to size storage for your install

Storage capacity = total camera bitrate × retention period. Practical numbers per camera at H.265+ continuous recording:

By resolution at 30-day retention

2MP HD-TVI: ~1 TB per camera.
4MP IP or HD-TVI: ~2 TB per camera.
6MP IP: ~3 TB per camera.
8MP / 4K IP: ~4 TB per camera.

Typical install configurations

4 cameras at 4MP, 30 days → ~8 TB. Single 8 TB drive.
8 cameras at 4MP, 30 days → ~16 TB. Single 16 TB drive or 2× 8 TB.
16 cameras at 4MP, 30 days → ~32 TB. 2× 16 TB drives or 3× 12 TB.
32 cameras at 6MP, 30 days → ~96 TB. 4× 24 TB drives.
16 cameras at 4K, 60 days → ~128 TB. RAID configuration; multiple drives.

Adjustments to the basic calculation

Motion-only recording — reduces storage 50-80% depending on activity level. Worth modelling for low-activity sites.
Variable bitrate (smart H.265+) — reduces storage 30-50% vs fixed bitrate. Standard on most current cameras.
Lower frame rate — reducing from 25 fps to 15 fps cuts storage proportionally, with modest impact on usability.
Higher retention — scales linearly. 60-day retention = 2× the 30-day calculation; 90-day = 3×.

SkyHawk vs SkyHawk AI vs WD Purple

Seagate SkyHawk

Standard surveillance drive. Sizes 1 TB through 8 TB. Suits typical residential and small-commercial installs (4-16 cameras, single drive). 24/7 rated, 180 TB/year workload, 3-year warranty.

Seagate SkyHawk AI

Premium surveillance drive optimised for NVRs running AI analytics on the drive (event-rich recording with frequent metadata writes). Sizes 8 TB through 24 TB. Suits AcuSense Pro NVRs, DeepinView installs, and any NVR running heavy analytics. 24/7 rated, higher workload tolerance (550 TB/year), 5-year warranty. Use this for any Pro/Ultra tier install.

Western Digital Purple

Surveillance drive equivalent to SkyHawk. Sizes 1 TB through 22 TB. AllFrame technology for multi-camera vibration management. 24/7 rated, 180 TB/year workload, 3-year warranty. Pricing typically parallel to SkyHawk; choice between SkyHawk and WD Purple often comes down to availability and personal preference.

Western Digital Purple Pro

Premium WD equivalent to SkyHawk AI. Sizes 8 TB through 22 TB. Higher workload rating, longer warranty, optimised for analytics-enabled NVRs.

RAID for redundancy

For commercial installs where storage failure means losing footage, RAID configurations on Pro and Ultra tier NVRs provide redundancy:

RAID 1 (mirror) — 2 drives, full redundancy, 50% effective capacity. Suits small commercial installs prioritising simplicity.
RAID 5 — 3+ drives, single-drive failure tolerance, capacity = (N-1) × drive size. Common in mid-commercial.
RAID 6 — 4+ drives, two-drive failure tolerance, capacity = (N-2) × drive size. Standard in enterprise.
RAID 10 — 4+ drives, multiple-drive failure tolerance with performance, capacity = N/2 × drive size. High-performance enterprise.

RAID does not replace backup — it protects against drive failure, not against site disaster, deletion or ransomware. Critical installs supplement RAID with off-site backup or remote NVR aggregation.

Drive lifecycle and replacement

Typical surveillance drive lifespan: 3-5 years under continuous 24/7 use.
Failure signals: increased SMART error counts, slower seek times, occasional read errors. Modern NVRs report these via SMART monitoring.
Replacement planning: for commercial installs, plan replacement at 4 years before failure occurs. Schedule the replacement during maintenance windows.
RAID rebuild time: rebuilding a failed drive in a RAID array can take 24-48+ hours on large arrays; the array is vulnerable during rebuild. Plan accordingly.

Why buy from Security Cameras Australia

Authorised dealer for Seagate and Western Digital surveillance drives · genuine Australian stock with full manufacturer warranty.
Expert support · advice on capacity sizing, RAID configuration, drive selection for your specific NVR and camera mix.
Bulk-quantity pricing for multi-drive RAID and enterprise installs.
Price-match · free shipping · 30-day returns.

Shop CCTV hard drives

Browse below, or see NVRs and DVRs for matching recorders, or UPS for power protection.

Frequently Asked Questions about Hard Drives for CCTV

Can I use a regular desktop hard drive in my NVR?

Technically yes — most NVRs accept any standard SATA hard drive. But desktop drives are designed for ~8 hours/day moderate use, not 24/7 continuous write loads from multiple cameras. They typically fail within 1-3 years under CCTV use, vs 3-5+ years for surveillance drives. The cost difference at install is modest; the cost of replacement (and lost footage) when the desktop drive fails is significant. Always specify surveillance-grade — Seagate SkyHawk or WD Purple.

How much storage do I need for an 8-camera 4MP install at 30-day retention?

Roughly 16 TB for continuous H.265+ recording across 8× 4MP cameras at 30-day retention — single 16 TB drive or 2× 8 TB. Numbers vary with activity level (motion-only recording reduces 50-80%), variable bitrate (smart H.265+ reduces 30-50% vs fixed), and frame rate. The 2 TB-per-4MP-camera-per-30-days rule of thumb works for most installs.

What's the difference between SkyHawk and SkyHawk AI?

SkyHawk is the standard surveillance drive for typical residential and small-commercial installs (24/7 rated, 180 TB/year workload, 3-year warranty). SkyHawk AI is premium — optimised for NVRs running on-camera or on-NVR AI analytics (AcuSense Pro, DeepinView), with higher workload tolerance (550 TB/year), 5-year warranty, and tuning for the event-rich write pattern that analytics produce. For Pro and Ultra tier NVRs with AcuSense Pro, specify SkyHawk AI. For Value tier with basic NVRs, standard SkyHawk is enough.

Do I need RAID for my CCTV install?

For residential and small commercial where some footage loss is acceptable: no, single drive is fine. For commercial installs where losing footage to drive failure is problematic: yes, RAID 1 (mirror) gives simple redundancy. For larger installs with retention or compliance requirements: RAID 5 or RAID 6. RAID protects against drive failure, not against site disaster, deletion or ransomware — critical installs supplement with off-site backup. Confirm the NVR tier supports RAID — most Pro and all Ultra tier do; Value tier typically doesn't.

What's the largest hard drive I can use in an NVR?

Depends on the NVR. Most current Hikvision Pro and Ultra NVRs support up to 24 TB per bay (the current largest surveillance drive size). Older NVRs may cap at 16 TB or smaller — check the NVR spec. Multi-bay NVRs (Pro and Ultra tier with 2-8 bays) support multiple drives up to the per-bay maximum, scaling to 8× 24 TB = 192 TB raw capacity on top-tier Ultra NVRs. For the largest installs, multiple NVRs or VMS-aggregated architectures handle the storage budget.