NVR Hard Drive: AI-Tier Drives, Bay Ratings and Replacement Checks

NVR hard drive for AI cameras: Purple Pro and SkyHawk AI side by side

Network recorders that run analytics are where the AI-stream figure on a data sheet comes in. Both makers print one for their top surveillance line, and both print the same number.

Seagate also rates SkyHawk AI at up to 2.5M hours MTBF, with 2M hours on the 8TB and 10TB models, and calls its 550TB a year more than three times a standard surveillance drive. On workload, AI streams and bays the two lines are rated alike, so the choice between them comes down to price per terabyte, the capacity you need and whether your recorder's list names the part number.

NVR hard drive 8TB, 16TB and larger: AI-tier prices

In all, the table draws on 22 listings in stock. The table shows 12 listings, with the lowest price per terabyte at £25.76/TB. Prices are pounds sterling inc VAT. The table is capped and sorted by price per terabyte, so if you came looking for an 8TB or 16TB NVR drive and the size is not here, an offer for it may still be in stock further down the price order. The wider table below adds the standard tier.

NVR hard drive 4TB to 12TB and up: bay ratings on each sheet

Maker sheets also give the number of drive bays a drive is rated for, which matters in a recorder that holds several disks. These are ratings for the drive, not statements about any recorder's own limits.

• WD Purple Pro: no limit, on every model WD lists.
• Seagate SkyHawk AI: unlimited, on every model on DS1960.15C.
• Seagate SkyHawk 8TB, 6TB and 4TB: up to 16 bays.
• Seagate SkyHawk 3TB and 2TB: up to 8 bays.
• WD Purple 12TB, 10TB and WD82PURZ, on the April 2019 sheet: 16+ bays.
• WD Purple 4TB to 8TB, WD81PURZ included: 8+ bays; the lower capacities: 8.

In a recorder with more than eight bays, the 2TB and 3TB SkyHawk models sit outside their own sheet rating, and the larger standard drives stop at 16.

Standard-tier drives for an NVR without analytics

If your recorder does not run analytics, the standard tier is the lower-rated option: Seagate's standard SkyHawk is rated at 180TB a year for always-on use. WD's April 2019 sheet adds a middle rung, its AllFrame AI models WD121PURZ, WD101PURZ and WD82PURZ at 360TB a year, double the AllFrame 4K figure.

This wider table holds 12 listings, the lowest at £25.76/TB. It mixes both tiers, so read the family in each title. The AI table above matches the SkyHawk AI and Purple Pro names only; a Toshiba S300 Pro therefore shows here and not there, and we have not found a Toshiba document in our sources that rates it.

NVR hard drive replacement: checks before you swap

Hikvision gives each recorder series its own drive table in its v20260515 list. One NVR table, headed [NVR] DS-76 77 86 96 NXI-I/VPro (K22B1), has 117 lines dated 15 May 2026; among them are WD122PURP, the 12TB Purple Pro, WD121PURA, WD102PURP, ST8000VE001 and ST4000VX016.

• Open your own NVR's table: a drive in one series table is not a promise for another series, and the same drive can carry different dates in different tables.
• Skip IoT-model drives: Hikvision rules them out of its NVRs and DVRs because they are encrypted.
• If the NVR uses RAID, Dual-VCA data storage or custom log storage, avoid anything in Hikvision's DM SMR table, which it restricts to normal storage.

A drive's bay rating and a recorder's maximum are different limits. We have not found a recorder maker's document in our sources that states the second for any model, so take it from your NVR's manual. The CCTV storage calculator sizes a replacement from your camera count, and CCTV hard drive sets out the full workload ladder across recorder types.