WD Purple HDD Spec and Price in the United States
WD Purple is the surveillance line, tuned for the sequential-heavy write pattern of NVR and DVR recording rather than random access, per the WD data sheet. The 1-8TB SKUs spin at 5400rpm and the larger capacities at 7200rpm, all with a 3.5-inch SATA form factor and a three-year warranty. AllFrame technology is WD's marketing for the firmware's stream-alignment; the practical claim — it won't drop frames when a recorder writes many streams at once — is what the line is bought for.
Captured periodically and may have changed.
- 2TB
- 4TB
- 8TB
- 12TB
Each point is one capture, not a list price. How we track prices
Specifications
- Capacity
- 2TB
- Interface
- SATA
- Sequential read
- 145 MB/s
- Sequential write
- 145 MB/s
- Rotation speed
- 5400 RPM
- Form factor
- 3.5-inch
- Cache
- 64 MB
- Warranty
- 3 years
Capacities
| Configuration | Part number | Rotation speed | Cache | Current best price |
|---|---|---|---|---|
| 2TB | WD20PURZ | 5400 RPM | 64 MB | $169.99 at Newegg · captured 2026-09-15 |
| 4TB | WD40PURZ | 5400 RPM | 64 MB | $174.00 at Amazon.com · captured 2026-09-15 |
| 8TB | WD81PURZ | 5400 RPM | 256 MB | $354.99 at Amazon.com · captured 2026-09-15 |
| 12TB | WD121PURZ | 7200 RPM | 256 MB | $635.00 at Amazon.com · captured 2026-09-15 |
Guides for this category
What owners and reviewers say
Summarised from 1 source(s), reviewed September 13, 2026. A source is counted only where it names this model exactly. How we track prices
Commonly praised
- Purpose-built for always-on high-definition surveillance systems.
- Keeps footage on-site, giving full control and avoiding recurring cloud fees, and works with many vendors' hardware.
Sources behind this summary
Sources
Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.