Western Digital (WD) is well-known for its dependable data storage.  However, with so many models to choose from, how can you select the finest hard drive for your needs?

 Today, we're going to look at three 4TB WD hard drives that are suitable for both surveillance systems and enterprise-level environments:

1. WD Purple WD40PURX 4TB Surveillance Hard Drive

Key Specs:

• Type: Surveillance
• Speed: 5400 RPM class
• Interface: SATA 6Gb/s
• Cache: 64MB
• Size: 3.5 inch

Why Choose It?
The WD40PURX is designed primarily for 24/7 video recording and is excellent for CCTV and home surveillance systems.  It supports up to 64 HD cameras and utilizes AllFrame™ technology to enhance playback quality and minimise frame loss.

Perfect For: Home security, small business CCTV, DVR systems.

2. Western Digital WD4000FYYZ 4TB Enterprise Hard Drive

Key Specs:

• Type: Enterprise/Datacenter
• Speed: 7200 RPM
• Interface: SATA 6Gb/s
• Cache: 64MB
• Size: 3.5 inch

Why Choose It?
The WD4000FYYZ is built for performance, durability, and reliability in high-demand server or RAID environments. With its 7200 RPM speed and stable architecture, it's made to handle large-scale workloads around the clock.

Perfect For: Servers, data centers, NAS setups, IT professionals.

3. WD Purple WD40PURZ 4TB Surveillance Hard Drive

Key Specs:

• Type: Surveillance
• Speed: 5400 RPM class
• Interface: SATA 6Gb/s
• Cache: 64MB
• Size: 3.5 inch

Why Choose It?
A newer version of the WD40PURX, the WD40PURZ continues the tradition of surveillance excellence. It’s optimized for high write-cycle environments and supports AI-enabled NVR systems. The WD40PURZ also uses AllFrame AI™ for improved reliability and real-time processing.

Perfect For: Modern surveillance systems, AI-ready setups, security businesses.

Which One Is Right for You?

Need help choosing? Reach out to our team—we’re happy to guide you to the perfect storage solution.