Western Digital or WD? NAS Hard Drives Compared in 2026
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This comparison examines the western digital vs WD NAS hard drive options for your storage needs. Both drives offer 3.5-inch form factors and SATA 6Gb/s interfaces suitable for network attached storage systems. They share identical 64MB cache sizes and support 24/7 operation for continuous use. The main difference lies in their capacity and rotational speed. One drive provides 1TB with variable IntelliPower speeds, while the other delivers 4TB at a steady 7200 RPM for higher performance.
Key differences
| Aspect | Western Digital AV-GP 1TB 3.5-Inch Hard Drive | WD Ultrastar 4TB 7200 RPM Hard Drive |
|---|---|---|
| Storage Capacity | 1TB | 4TB |
| Rotational Speed | 5400RPM~7200RPM (IntelliPower) | 7200 RPM |
| Cache Size | 64MB | 64MB |
| Form Factor | 3.5in | 3.5 Inch |
| Hardware Interface | SATA 6Gb/s | SATA 6.0Gb/s |
Which one should you choose?
Choose Western Digital AV-GP 1TB 3.5-Inch Hard Drive if
- You need a lower capacity drive for basic surveillance or light NAS tasks.
- You prioritize lower power consumption and cooler operating temperatures.
Choose WD Ultrastar 4TB 7200 RPM Hard Drive if
- You require higher storage capacity for large datasets or media libraries.
- You want consistent 7200 RPM performance for faster data transfer rates.
Verdict: Choose the 1TB drive if your workload is light and power efficiency is a priority. Select the 4TB drive if you need more storage and consistent high-speed performance for demanding NAS or server environments. Both units support continuous operation and standard SATA connections.
Western Digital vs WD NAS Drive Specs
Storage capacity
The WD Ultrastar DC HC320 offers 4TB of storage space. This provides four times the data holding ability of the Western Digital AV-GP, which holds only 1TB. If you need to store large video libraries, extensive backups, or run a media server with many files, the Ultrastar is the clear choice. The AV-GP is better suited for small home setups or basic surveillance where space is not a constraint. You must decide if your current data volume justifies the larger drive or if the 1TB capacity meets your needs perfectly.
Rotational speed
The WD Ultrastar runs at a fixed 7200 RPM. This constant speed ensures consistent performance for read and write operations, which is critical for enterprise environments and high-performance NAS arrays. The Western Digital AV-GP uses IntelliPower technology, which varies its speed between 5400 RPM and 7200 RPM. While this helps reduce power consumption and heat, it may result in slower data transfer rates during heavy workloads. For users prioritizing raw speed and responsiveness in a network environment, the fixed higher speed of the Ultrastar is superior.
Cache size
Both drives feature a 64MB cache. This buffer memory helps manage data flow between the drive platters and the SATA interface, reducing latency during burst transfers. Since the cache size is identical, there is no performance difference in this specific area. You will not gain an advantage in short-term data buffering by choosing one over the other. This specification does not help distinguish between the two products for your specific use case, as both handle small data packets equally well.
Form factor
Both the Western Digital AV-GP and the WD Ultrastar utilize a 3.5-inch form factor. This standard size is compatible with most desktop computers, server racks, and NAS enclosures designed for internal drives. You can install either drive into the same bays without needing adapters or special mounting hardware. The physical dimensions are standard for this category, ensuring that fitment is not a concern for your storage project. Both drives will slot into your chassis with equal ease.
Hardware interface
Each drive connects via a SATA 6Gb/s interface. This standard ensures compatibility with virtually all modern motherboards, RAID controllers, and NAS systems that support SATA III. You do not need to worry about cable types or port speeds, as both drives operate at the same maximum bandwidth. This interface allows for data transfer rates up to 600MB/s, limited by the drive mechanics rather than the connection. Your existing SATA cables will work perfectly with either option.
Physical dimensions
The WD Ultrastar is longer than the Western Digital AV-GP. The Ultrastar measures 5.8 inches in length, while the AV-GP is 4.8 inches long. Both share the same width and height. If you are installing these drives in a tight enclosure with limited depth, the shorter AV-GP might fit more easily. However, in standard 3.5-inch bays, this difference is negligible. You should check your specific NAS or case dimensions if space is extremely constrained, as the extra inch on the Ultrastar could be a factor.
Which NAS drive suits your needs
Small home server users
The Western Digital AV-GP holds 1TB of data. It uses IntelliPower technology for variable rotation speeds. This design targets lower power consumption during operation. The 64MB cache supports basic network storage tasks. It is suitable for light surveillance or media server duties.
Data center and enterprise users
The WD Ultrastar DC HC320 provides 4TB of storage capacity. It runs at a consistent 7200 RPM for faster data transfer. The drive supports high workload capacities for business-critical applications. Enhanced vibration protection helps maintain data integrity in RAID systems. It is built for continuous 24/7 operation in demanding environments.
Users needing high capacity
You get 4TB of space with the WD Ultrastar drive. This is four times the storage of the 1TB alternative. The 7200 RPM speed ensures reliable throughput for large files. It handles heavy read and write workloads effectively. The 64MB cache remains consistent with the smaller drive.
The products compared
Western Digital AV-GP 1TB 3.5-Inch Hard Drive
Best for: Basic surveillance and light NAS use
- Storage Capacity
- 1TB
- Form Factor
- 3.5in
- Hardware Interface
- SATA 6Gb/s
- Rotational Speed
- 5400RPM~7200RPM
- Cache Size
- 64MB
- Dimensions
- 4.8 × 4 × 1 inches
View on Amazon: Western Digital AV-GP 1TB 3.5-Inch Hard Drive Affiliate link
This Western Digital drive offers 1TB of storage with IntelliPower technology, rotating between 5400 and 7200 RPM. It features a 64MB cache and a SATA 6Gb/s interface. Designed for 24/7 operation, it targets surveillance and NAS use. The 3.5-inch form factor fits standard bays. You get a bulk pack without accessories. It suits users needing reliable, continuous recording storage.
Pros
- 1TB storage capacity
- IntelliPower rotation speed
- 64MB cache size
- SATA 6Gb/s interface
Cons
- Lower capacity than 4TB competitors
- IntelliPower speed is not fixed
- No included cables or accessories
Good fit if
- You need 1TB for surveillance
- You want 24/7 operation reliability
- You use standard 3.5-inch bays
Skip if
- You need more than 1TB
- You require fixed 7200 RPM
- You want a 4TB drive
Verdict: Western Digital 1TB Surveillance HDD is a compact option for basic recording needs. It fits users who prioritize capacity flexibility over raw speed in a small footprint.
WD Ultrastar 4TB 7200 RPM Hard Drive
Best for: Enterprise NAS and server storage arrays
- Storage Capacity
- 4 TB
- Form Factor
- 3.5 Inch
- Hardware Interface
- SATA 6.0Gb/s
- Rotational Speed
- 7200 RPM
- Cache Size
- 64MB
- Dimensions
- 5.8 × 4 × 1 inches
View on Amazon: WD Ultrastar 4TB 7200 RPM Hard Drive Affiliate link
This WD Ultrastar DC HC320 is a 4TB enterprise-class drive built for 24/7 operation. It features a 7200 RPM rotational speed and 64MB cache with a SATA 6.0Gb/s interface. The 3.5-inch form factor fits standard NAS and server bays. You should choose this drive if you need high workload capacity and vibration protection for critical data storage in demanding environments.
Pros
- 7200 RPM rotational speed for fast data transfer
- 64MB cache supports heavy read/write workloads
- SATA 6.0Gb/s interface ensures reliable throughput
- Designed for 24/7 continuous operation
Cons
- SATA interface limits maximum transfer speeds compared to newer standards
- Heavy 1.83-pound build may require robust mounting
- Enterprise design lacks consumer-focused software features
Good fit if
- You need enterprise-grade reliability for a NAS
- You run servers or RAID systems requiring 24/7 uptime
- You prioritize rotational speed and workload capacity
Skip if
- You require silent operation for a home office
- You need compact 2.5-inch drives for mobile storage
- You want plug-and-play consumer software tools
Verdict: WD Ultrastar DC HC320 4TB delivers robust performance for professional environments. It is ideal for users building high-availability NAS systems that demand continuous operation and heavy workload support.
Specifications side by side
| Spec | Western Digital AV-GP 1TB 3.5-Inch Hard Drive | WD Ultrastar 4TB 7200 RPM Hard Drive |
|---|---|---|
| Storage Capacity | 1TB | 4 TB |
| Form Factor | 3.5in | 3.5 Inch |
| Hardware Interface | SATA 6Gb/s | SATA 6.0Gb/s |
| Rotational Speed | 5400RPM~7200RPM | 7200 RPM |
| Cache Size | 64MB | 64MB |
| Dimensions | 4.8 × 4 × 1 inches | 5.8 × 4 × 1 inches |
| Weight | not stated | 1.83 pounds |
| Size | 1 TB | 4 TB |
| Color | Silver | not stated |
| Model | WD10EURX-OEM-2YR-cr | HUS726T4TALE6L4/CR |
Frequently asked questions
Which WD drive is better for a home NAS?
The Western Digital AV-GP is the better choice for basic home use. It holds 1TB of data and uses a SATA interface. This model is designed for light NAS tasks and surveillance. Its compact size fits small enclosures. You get reliable storage for everyday files without needing enterprise-level performance.
Does the WD Ultrastar support 24/7 operation?
Yes, the WD Ultrastar 4TB supports continuous operation. It is built for enterprise NAS and server arrays. The drive spins at 7200 RPM for faster data access. It includes a 64MB cache to handle heavy workloads. This makes it suitable for high-availability systems that run constantly.
What is the difference in storage capacity between these two?
The WD Ultrastar offers 4TB of storage, while the AV-GP holds only 1TB. The Ultrastar provides four times the space. This makes it ideal for large libraries. The AV-GP is sufficient for basic records or light media storage. Choose based on how much data you need to keep.
Are both drives compatible with standard SATA ports?
Both drives use the SATA hardware interface. This ensures compatibility with most NAS systems and motherboards. The Western Digital AV-GP connects via SATA. The WD Ultrastar also uses SATA. You do not need special adapters for either drive in standard network storage setups.
Which drive has faster rotational speed?
The WD Ultrastar has a rotational speed of 7200 RPM. The AV-GP uses IntelliPower for variable speeds. Higher RPM generally means faster data transfer rates. The Ultrastar is better for demanding tasks. The AV-GP prioritizes efficiency over raw speed for lighter workloads.
Is the WD Ultrastar too large for a small NAS?
The WD Ultrastar measures 5.8 inches in length. It weighs 1.83 pounds. Standard 3.5-inch bays usually accommodate it. However, check your enclosure size first. The AV-GP is smaller at 4.8 inches long. It fits more easily in compact or limited-space NAS units.
Does the AV-GP have a cache?
Yes, the Western Digital AV-GP includes a 64MB cache. This memory helps buffer data during read and write operations. It supports basic network storage tasks efficiently. The cache size matches the WD Ultrastar. Both drives use this amount of cache for data management.