Seagate
Seagate Barracuda ST2000DM001 2 TB 3.5" 7200 rpm 64 MB SATA internal hard drive
$58.99
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Western Digital
Western Digital WD40PURZ 4TB 5400 RPM 64MB Cache 3.5" SATA internal hard drive
A 4TB 3.5" SATA drive built for 24/7 surveillance workloads with 64MB cache and 5400 RPM operation
- PackagingBare Drive
- InterfaceSATA 6.0Gb/s
- Capacity4TB
- NAND Flash Memory TypeHard Drive
- RPM5400 RPM
- Cache64MB
- Engineered for 24/7 surveillance workloads
- Supports up to 180TB per year workload rate
- 64MB cache optimises write-intensive streaming
- Tarnish-resistant components withstand NVR heat and vibration
- 5-inch SATA 6.0Gb/s interface fits standard bays
WD Purple 4TB surveillance drive
The WD Purple WD40PURZ is a 4TB 3.5-inch internal hard drive engineered for 24/7 video surveillance workloads. It connects via SATA 6.0Gb/s and is tuned for write-intensive, low bit-rate, high stream-count applications typical of NVR environments. The drive is tested for compatibility across a wide range of security systems. It is not suited for general desktop storage or workloads that demand low-latency random access.
Thermals, noise and power
Designed to withstand elevated heat fluctuations and equipment vibrations inside always-on NVR enclosures. The 5400 RPM spindle speed and surveillance-class firmware help manage thermal output during continuous write operations. Exclusive AllFrame technology reduces frame loss and improves video playback smoothness. Tarnish-resistant components add durability in harsh operating conditions.
180TB annual workload rating
The drive supports up to 180TB per year workload rate, a figure that determines whether it matches the write volume of your surveillance deployment. It also supports installations of more than 8 bays and includes TLER and ATA streaming support. Buyers needing higher capacity can choose models up to 18TB. Builders requiring a drive optimised for random read performance or desktop operating systems should select a different product class.
Highlights
- Engineered for 24/7 surveillance workloads
- Supports up to 180TB per year workload rate
- 64MB cache optimises write-intensive streaming
- Tarnish-resistant components withstand NVR heat and vibration
- 5-inch SATA 6.0Gb/s interface fits standard bays
Specifications
| Brand | WD |
|---|---|
| Series | Purple |
| Model | WD40PURZ |
| Packaging | Bare Drive |
| Interface | SATA 6.0Gb/s |
| Capacity | 4TB |
| NAND Flash Memory Type | Hard Drive |
| RPM | 5400 RPM |
| Cache | 64MB |
| Features | Capacity up to 18TB. Engineered specifically for surveillance security systems. Tuned for write-intensive, low bit-rate, high stream-count workloads typical to most surveillance applications. 8TB and above have additional enhancements and higher workload rate for AI-enabled recorders, systems and solutions. Supports up to 180 TB/yr workload rate (Up to 360 TB/yr workload rate on 8TB, 10TB, 12TB, 14TB and 18TB drives). Support for more than eight bays. Tarnish-resistant components. |
| Usage | For Video Surveillance |
| Form Factor | 3.5" |
| Height (maximum) | 26.10mm |
| Width (maximum) | 101.60mm |
| Length (maximum) | 147.00mm |
| Shipping weight | 0.79 kg |
| Package size | 210 × 156 × 114 mm |
Questions about this item
How do I install the 3.5" WD Purple drive in my NVR and which step do people most often miss?
Mount the drive using the 3.5" screw holes, connect the SATA 6.0Gb/s data cable and the SATA power connector, then enable TLER or ATA streaming in the NVR BIOS — that last setting is the one installers forget.
What maintenance or replacement will the WD40PURZ need after long-term 24/7 recording?
The drive is rated for a 180TB/year workload; once cumulative writes approach that annual limit you should plan a proactive swap to avoid unexpected downtime.
What is the first limit that appears when the 5400 RPM drive runs sustained multi-stream writes?
The 64MB cache and 5400 RPM spindle set the sustained write ceiling; under heavy stream counts you hit throughput saturation before thermal throttling becomes an issue.
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