Western Digital 22TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD221KFGX
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AI Verdict
This 22TB, 7200 RPM, CMR mechanical hard drive is for NAS systems with unlimited bays needing high-capacity, 24x7 data handling.
This drive is a strong fit for its intended purpose: high-intensity, 24x7 multi-user NAS environments. Its 22TB capacity, 7200 RPM, and 550TB/year workload rating directly address the needs of data-hungry applications and large-scale data storage.
If you need even higher endurance or a SAS interface, look for enterprise-grade drives like WD Gold or Ultrastar models, which often have higher MTBF and workload ratings.
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Pros
- Offers a substantial 22TB storage capacity, reducing the need for more physical drives in a NAS enclosure.
- Engineered for high performance with a 7200 RPM rotational speed and 512MB cache for efficient data access.
- Rated for a 550TB/year workload rate, designed for demanding 24x7 multi-user NAS environments.
- Features a 2.5 million hour Mean Time Between Failures (MTBF) and a 5-year limited warranty, indicating durability.
- Specifically designed for RAID-optimized NAS systems, ensuring compatibility and scalability with unlimited bays.
Cons
- Produces noticeable operational noise, especially during heavy data access, due to its higher RPM and 10-platter design.
- Power consumption will be higher compared to lower capacity or slower RPM drives, impacting electricity costs in large arrays.
- Some users have reported issues with retailers incorrectly claiming the drive is discontinued, leading to order cancellations.
Dimension Scores
The 7200 RPM rotational speed and 512MB cache contribute to fast file transfer and efficient data access, placing it above average for mechanical hard drives.
With a 2.5 million hour MTBF, 550TB/year workload rating, and a 5-year warranty, this drive is built for continuous, high-intensity operation, indicating top-tier reliability for its category.
Offering 22TB in a single 3.5-inch form factor provides industry-leading density for mechanical drives, making it ideal for maximizing storage in limited bay NAS systems.
Designed specifically for RAID-optimized NAS systems with unlimited bays and extensively tested with various NAS vendors, it offers very broad compatibility within its intended use case.
Best For
- Medium to large businesses requiring robust, high-capacity storage for 24x7 NAS operations.
- Creative professionals managing rapidly growing data archives and needing quick file sharing within a multi-user environment.
- Data hoarders or home lab enthusiasts building high-density NAS arrays with limited physical drive bays.
Not Recommended For
- Users prioritizing silent operation for a desktop PC or a NAS in a living space.
- Budget-conscious buyers who don't require 22TB per drive, as lower capacity drives offer a better price-per-TB ratio.
- Individuals with basic storage needs where a less robust, lower workload-rated drive would suffice.
Watch Out For
- Expect audible noise during operation; this drive is not quiet, especially under heavy load, due to its 7200 RPM and 10 platters.
- Be wary of retailers incorrectly stating the WD221KFGX is discontinued; verify directly with Western Digital if an order is cancelled.
- While the 550TB/year workload rate is high, exceeding this consistently could reduce the drive's lifespan, despite the 2.5 million hour MTBF.
Full Specifications
| ASIN | B0B5W1CQ8W |
| Brand | WD |
| Color | Red |
| Series | WD Red Pro |
| Language | English |
| Batteries | 1 AAAA batteries required. |
| Hard Drive | 22 TB Mechanical Hard Disk |
| Item Weight | 1.48 pounds |
| Manufacturer | Western Digital Technologies, Inc. |
| Special Feature | Not_Performance_Used |
| Flash Memory Size | 22 TB |
| Installation Type | Internal Hard Drive |
| Item model number | WD221KFGX-SPB9KN0 |
| Compatible Devices | NAS Server |
| Product Dimensions | 5.79 x 4 x 1.03 inches |
| Hard Disk Interface | Serial ATA-600 |
| Hard Drive Interface | Serial ATA-600 |
| Hard Disk Description | Mechanical Hard Disk |
| Hard Disk Form Factor | 3.5 Inches |
| Item Dimensions LxWxH | 5.79 x 4 x 1.03 inches |
| Connectivity Technology | SATA |
| Digital Storage Capacity | 22 TB |
| Hard Drive Rotational Speed | 7200 RPM |
What Buyers Say
What really stands out is how many users are upgrading to these 22TB drives to consolidate their storage, especially those with limited NAS bays, effectively turning a 2-bay into a 44TB beast. People are consistently reporting easy installation and fast file transfers, which is exactly what you want from a high-capacity drive. The main trade-off, as expected with high-performance mechanical drives, is the noise level; it's definitely not a silent operator, particularly when it's working hard. There's also a weird recurring issue where some retailers incorrectly claim the drive is discontinued, leading to order cancellations, which is a frustrating hiccup for buyers.
“Man, this 22TB drive is a lifesaver for my Plex server, finally got all my movies in one place, but seriously, it sounds like a tiny washing machine when it's scrubbing data, totally worth it though.”
Common Praise
- Installs quickly and is recognized by the operating system without issues.
- Achieves very fast file transfer speeds.
- Provides massive storage capacity, allowing consolidation of multiple smaller drives.
- Maintains consistent performance even under heavy, continuous use in NAS environments.
- The 5-year warranty provides peace of mind for long-term data storage.
Common Complaints
- Generates noticeable noise, including clicks and hums, especially during active data access.
- Some retailers have incorrectly stated the drive is discontinued, causing order cancellations.
- Higher power consumption compared to lower RPM or smaller capacity drives.
Ownership Tips
- The drive's noise is more pronounced in open-air setups or less insulated NAS enclosures.
- Performance remains consistent even when the drive is nearly full, which isn't always the case with other drives.
- The weight and physical size are typical for a 3.5-inch HDD, but the density of 10 platters is something to consider for vibration dampening.
- Initial spin-up can be a bit slow, but once active, access times are quick for a mechanical drive.
- Monitoring SMART data shows stable temperatures even under sustained heavy writes in a well-ventilated NAS.
Frequently Asked Questions
Is this drive suitable for a home NAS?
Yes, if you have significant storage needs and a NAS enclosure designed for 3.5-inch drives. However, be aware that it's designed for demanding 24x7 environments and might be louder than consumer-grade drives.
What is CMR and why does it matter?
CMR stands for Conventional Magnetic Recording. It's important because it offers consistent performance, especially in RAID arrays, unlike SMR (Shingled Magnetic Recording) drives which can experience performance degradation during writes.
How does the 550TB/year workload rate translate to daily use?
This means the drive is rated to handle up to 550 terabytes of data written or read in a year. For a 24x7 environment, that's roughly 1.5 terabytes per day, indicating it's built for constant, heavy data transfer.
Will this drive work in any NAS?
It's designed for NAS systems with an unlimited number of bays and Western Digital tests for broad compatibility. However, always check your specific NAS enclosure's compatibility list for 22TB drives before purchasing.
Is the 512MB cache important?
Yes, a larger cache like 512MB helps improve performance by temporarily storing frequently accessed data, leading to faster read and write operations, especially in multi-user environments.
Buying Guide
When you're looking at a drive like this, you're not just buying storage; you're buying a workhorse for a NAS. You need to think about how much data you're actually moving around daily, not just how much you want to store. This drive is built for constant activity, so if your NAS is just sitting there most of the time, you might be overspending. Also, consider the noise – these aren't silent, so where your NAS lives matters.
Capacity (22 TB)
This is how much data the drive can hold, like the size of a storage locker. 22TB is massive, letting you store huge amounts of files or consolidate many smaller drives into one, which is great if your NAS only has a few drive bays.
7200 RPM
This is how fast the internal platters spin, like the engine speed in a car. Higher RPM (7200 here) means faster data access and transfer speeds, which is crucial for a NAS where multiple users or applications might be hitting the drive simultaneously.
Workload Rate (550TB/year)
This spec tells you how much data the drive is designed to reliably read and write over a year, like a mileage rating for a truck. A 550TB/year rating means this drive is built for heavy, continuous use, far beyond what a typical desktop drive handles.
CMR (Conventional Magnetic Recording)
This refers to the technology used to write data. CMR drives write data in parallel tracks, ensuring consistent performance, especially for sustained writes and RAID rebuilds. It's like having dedicated lanes on a highway, preventing slowdowns you might see with SMR (shingled) drives.
Alternatives
If 22TB is overkill or too noisy, look for lower capacity 7200 RPM CMR drives for NAS, or if silence is paramount and performance less critical, consider 5400 RPM or 5900 RPM NAS-specific drives. For even higher performance and lower noise, but at a much higher cost per TB, consider enterprise-grade SSDs.
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