Which HDD for a 24/7 Factory NVR: Surveillance vs Desktop Drives, Workload, MTBF and ₹/TB (India, Oct 2026)
Which hard disk should go in a factory NVR that records 24/7? A surveillance drive. As of 15 Oct 2026, WD Purple, Seagate SkyHawk and Toshiba S300 datasheets rate 180 TB/year of workload and 24×7 power-on. Seagate's BarraCuda 2–8 TB desktop datasheet rates 55 TB/year and 2,400 power-on hours a year, about a quarter of a year.
Last checked: 15 Oct 2026
Verified against
- Western Digital, WD Purple product brief, PB_WD_Purple_HDD (2024-01), models WD11PURZ to WD85PURZ.
- Western Digital India, WD Purple Pro product page (WD8002PURP to WD260PURP) and WD Blue PC desktop page.
- Seagate, SkyHawk 3.5 HDD data sheet DS1902.17-2107US, July 2021, linked from the SkyHawk support page, India; SkyHawk product page.
- Seagate, BarraCuda 3.5 HDD data sheet DS17.2-2603US.
- Toshiba Electronics Europe, S300 surveillance HDD flyer, 04/2025; Toshiba, S300 Pro page with S300 AI / Pro / S300 comparison; Toshiba warranty table, EMEA.
- NVR makers: Hanwha Vision, HDD Compatibility List Rev 11.29, 28 Aug 2024; Hikvision USA, hard drive compatibility list article; CP Plus, HDD Compatibility List.
- Prices: Amazon.in search listings by exact model number, read 16 Oct 2026.
- Checked 15 Oct 2026.
Drive class → workload → MTBF → warranty → ₹/TB
All rows are downloadable as surveillance-hdd-nvr-factory-india.csv. "Continuous Mbps" is our arithmetic: the TB/year rating spread over 8,760 hours (1 TB = 10¹² bytes, as WD defines it).
| Drive line (class) | Workload (TB/yr) | Continuous Mbps that uses it up | Power-on (h/yr) | MTBF (h) | Max drive bays | Recording | Warranty (yrs) | Source |
|---|---|---|---|---|---|---|---|---|
| WD Purple 1–8 TB (surveillance) | 180 | 45.7 | 24×7 | 1,000,000 at 90 TB/yr, 40 °C | 8 (1–2 TB), 16 (3 TB+) | CMR | 3 | WD brief 2024-01 |
| WD Purple Pro 8–26 TB (AI surveillance) | 550 | 139.5 | 24×7 | up to 2,500,000 at 220 TB/yr, 40 °C | not stated on page | CMR | 5 | WD India page |
| Seagate SkyHawk 1–8 TB (surveillance) | 180 | 45.7 | 8,760 | 1,000,000 | 8 (most 1–3 TB), 16 (4–8 TB) | CMR; SMR on ST4000VX013, ST2000VX015 | 3 | DS1902.17 |
| Toshiba S300 2–6 TB (surveillance) | 180 | 45.7 | 24×7 | 1,000,000 (MTTF) | 8 | SMR | 3 | Toshiba flyer 04/2025 |
| Toshiba S300 Pro 4–10 TB (surveillance) | 300 | 76.1 | — | 1,200,000 | 24 | CMR | not in EMEA warranty table (checked 15 Oct 2026) | Toshiba S300 Pro page |
| Toshiba S300 AI (AI surveillance) | 550 | 139.5 | — | up to 2,500,000 | 24 | CMR | 5 | same; EMEA warranty |
| Seagate BarraCuda 2–8 TB (desktop) | 55 | 14.0 | 2,400 | not in datasheet | not stated | SMR | 2 | DS17.2-2603US |
| Seagate BarraCuda 12–24 TB (desktop) | 120 | 30.4 | 2,400 | not in datasheet | not stated | CMR | 2 | same |
WD defines workload as "user data transferred to or from the hard drive", so playback, search and export count against it alongside recording. Toshiba's S300 flyer states "24 x 7 operation: yes"; Seagate's SkyHawk sheet states 8,760 power-on hours per year.
Listing prices on Amazon.in (16 Oct 2026)
| Model | Class | Capacity (TB) | Listing price (₹) | ₹ per TB | Listing |
|---|---|---|---|---|---|
| Seagate SkyHawk ST4000VX016 | Surveillance | 4 | 18,420 | 4,605 | ASIN B0B5573SSV |
| Toshiba S300 HDWT840UZSVA | Surveillance (SMR) | 4 | 20,999 | 5,250 | ASIN B0974Y9725 |
| Seagate BarraCuda ST4000DM004 | Desktop (SMR) | 4 | 21,499 | 5,375 | ASIN B07115ZSQ6 |
| WD Purple WD43PURZ | Surveillance | 4 | 39,999 | 10,000 | ASIN B0CC6SB4F4 |
| WD Purple WD85PURZ | Surveillance | 8 | 49,399 | 6,175 | ASIN B0CP314RM7 |
| WD Purple Pro WD8002PURP | AI surveillance | 8 | 49,749 | 6,219 | ASIN B0D1V1J2H6 |
| Seagate SkyHawk ST8000VX010 | Surveillance | 8 | 72,790 | 9,099 | ASIN B0BLT41GSM |
These are marketplace listings on one day, not list prices. The same day a second ST4000VX016 listing read ₹21,399, and a "WD Purple 4TB" listing without a model number in its title read ₹21,449. On 16 Oct 2026 the 4 TB desktop BarraCuda cost more than the 4 TB SkyHawk, so "desktop is cheaper" did not hold on that date.
Worked check: will one drive carry your cameras?
Assume 24 cameras at 4 Mbps each, H.265, recording continuously. That is 96 Mbps, which writes about 378 TB a year (96 Mbps ÷ 8 × 31.5 million seconds).
| Disk set | TB/yr per drive | WD Purple / SkyHawk / S300 (180) | WD Purple Pro / S300 AI (550) | BarraCuda 2–8 TB (55) |
|---|---|---|---|---|
| 1 drive | 378 | Over the rating | Within | Seven times over |
| 2 drives, recording spread | 189 | Slightly over | Within | Over |
| 4 drives, recording spread | 95 | Within, near WD's 90 TB/yr MTBF test point | Within | Over |
The 180 TB/yr line equals about 45.7 Mbps of continuous traffic per drive. The 55 TB/yr desktop rating equals about 14 Mbps, three to four cameras at 4 Mbps. How many days that disk set holds is a separate question: see how many days a 4 TB or 8 TB NVR records and the storage calculator. H.265 and smart codec lower the Mbps and therefore the workload too.
Where brands differ
- SMR vs CMR at 4 TB. WD Purple 1–8 TB is CMR throughout (WD brief 2024-01). Seagate lists two 4 TB SkyHawks: ST4000VX016 CMR and ST4000VX013 SMR (DS1902.17). Toshiba's S300 2–6 TB is SMR (flyer 04/2025). Read the exact model number on the quote.
- Bays. WD Purple 1–2 TB and Toshiba S300 are rated for up to 8 bays; WD Purple 3 TB+ and SkyHawk 4–8 TB for 16; Toshiba S300 Pro and S300 AI for 24.
- MTBF test conditions. WD states its MTBF at 90 TB/yr and 40 °C (Purple) or 220 TB/yr and 40 °C (Purple Pro), "derated" above that up to 65 °C. Seagate's SkyHawk sheet says it does "not recommend operating at sustained extreme temperatures". Toshiba's S300 Pro page advises keeping the drive surface below 60 °C.
- Desktop warranty. Seagate BarraCuda carries 2 years (DS17.2-2603US). WD's India page lists WD Blue desktop drives at a "2-Year Limited Warranty". Toshiba's EMEA table lists its P300 desktop line at 2 years and the S300 at 3.
NVR compatibility lists
- Hanwha Vision publishes a full list (Rev 11.29, 28 Aug 2024). It lists Seagate SkyHawk (VX), WD Purple (PURZ/PURX) and enterprise drives, with SMR drives in a separate section. No Seagate BarraCuda (DM) or WD Blue (EZ) desktop model appears in it, and no Toshiba drive (checked 15 Oct 2026).
- Hikvision says it has a compatibility list as a PDF attachment; RAID-compatible drives carry a "Y" in the "RV" column. The attachment on the USA article is dated 24 Nov 2022.
- CP Plus runs an HDD Compatibility List search under Support: enter your NVR model number to get compatible drive models, capacity, interface and form factor.
What breaks in a factory
- Heat in the panel room. WD Purple's 0–65 °C and SkyHawk's 65–70 °C maximum (by model) are drive temperatures, not room temperatures. A closed steel panel beside a furnace or compressor can push a drive past WD's 40 °C MTBF point; S.M.A.R.T. shows the drive's own reading.
- Dust. The usual failure path is indirect: a clogged NVR fan or filter lets the drive run hotter. Clean the filter on the PM schedule and watch the S.M.A.R.T. temperature.
- Power cuts and DG changeover. If a disk shows "uninitialized" after a hard power-off, read what to check before you format and size a UPS with the NVR UPS backup calculator.
- Many cameras on one disk. More than about 11 cameras at 4 Mbps on a single 180 TB/yr drive exceeds its rating (45.7 Mbps). Spread recording over more drives.
- RAID in a 16-bay recorder. Use drives rated for that bay count: WD Purple 1–2 TB, most SkyHawk 1–3 TB and Toshiba S300 stop at 8.
When to call the installer / what to ask the vendor
Ask for the exact drive model number on the quote, and check it against the NVR maker's compatibility list. Ask whether it is CMR or SMR, its TB/yr rating, and who carries the disk warranty: CCTV makers' policies are often silent on the disk, see CCTV warranty by brand.
Where Mama fits
Mama reads a factory's existing cameras over RTSP/ONVIF and reports machine idle time to the owner each morning; it reads the live camera streams, so the choice of NVR disk stays the same. More at askthemama.com. Leave an email or phone in the form below.
FAQ
Can I use a normal desktop hard disk in an NVR or DVR?
It will usually be detected, but it is not rated for the job. Seagate rates its BarraCuda desktop drives for 2,400 power-on hours a year and 55 TB/yr (2–8 TB); an NVR runs 8,760 hours. Hanwha's 2024 compatibility list includes no desktop BarraCuda or WD Blue model.
WD Purple or Seagate SkyHawk: which is better for CCTV?
On paper they match: both are rated 180 TB/yr, 1,000,000 hours MTBF and 3 years warranty, and both makers advertise up to 64 cameras. At 4 Mbps each, though, 180 TB/yr covers about 11 cameras recording continuously. Choose by the CMR model at your capacity, by your NVR's compatibility list, and by local price on the day.
What is the difference between WD Purple and WD Purple Pro?
WD Purple Pro is rated for 550 TB/yr against 180, MTBF up to 2.5 million hours against 1 million, and a 5-year warranty against 3. WD adds 32 concurrent AI streams. It suits recorders that run analytics or many high-bitrate cameras per drive.