Tom’s Hardware Verdict

The WD Gold 24TB HDD brings no surprises, providing satisfactory performance for mechanical storage. It’s pricey but includes unique features thanks to the OptiNAND and ArmorCache technologies.

Pros

• +

  High capacity

• +

  OptiNAND and ArmorCache technology

The

WD Gold 24TB

comes as the largest capacity hard drive currently available — other 24TB drives exist, but nothing larger can be purchased. It competes with the

best hard drives

primarily by offering more storage, but at a higher cost per GB. Western Digital has been around for decades in the storage world, and its color naming scheme is simple and easy to understand. The Gold drives represent its most performant line of HDDs and are intended for enterprise use.

Like its Seagate competitor, there’s some blurring across models such that differences are often fairly superficial. We even reviewed the

Exos X20 and IronWolf Pro HDDs

together in the past. While WD’s Gold line does share the flash-based OptiNAND technology with its Red Pro NAS line of HDDs, it has a unique feature to help it stand out: ArmorCache.

We discussed this technology in our

WD Gold 22TB review

and not a whole lot has changed with the 24TB drive. There are some minor performance differences but, on the whole, this drive is about getting the highest density of storage possible. OptiNAND helps with that, but there are side benefits for certain workloads as well, as addressed in our

WD Red Pro

review. You can get 24TB in other drives, like the

WD Red Pro 24TB

,

Seagate IronWolf Pro 24TB

,

Seagate Exos X24 24TB

,

Seagate Skyhawk AI 24TB

, or

WD Ultrastar DC 24TB

, but this is the first 24TB drive we’ve received for review. The primary attraction with the WD Gold is its ArmorCache technology. If you can make do with slightly lower storage density, though, the 22TB also has this feature at a lower cost.

Who would want ArmorCache? Someone who needs data protection without losing performance. In an environment that can use write caching, the Gold can safely write data out on power loss. In a stricter environment where write caching is denied, the Gold can maintain performance by leveraging the benefits of its flash. This has niche use outside of enterprise, but for diehards who want these benefits, the Gold is the only way to go. Luckily, its traditional HDD performance isn’t terrible, either; let’s take a look.

The 24TB WD Gold is very similar to the 22TB model that we reviewed late last year. The capacity is higher, sure, but so is the price, closing in on $600 while the 22TB has currently fallen to $459.99. However, there are cases where you need every TB possible in the same space, and that’s what you are paying a premium for with this model. Capacities continue to slowly creep up, and new technologies on the roadmap with 24TB currently being the retail height.

The other differences are minor. The 24TB model goes from 291 MB/s to 298 MB/s for the maximum sustained transfer rate, a small bump. It’s still using a 10-platter solution with the side benefit that it’s also more power-efficient, operating at 6.8W instead of 7.1W. Otherwise, the warranty is the same, comparable to its direct peers at five years in length with a 550 TB/year workload limit and a 2.5 million hour MTBF.

Beyond the SATA connectors for data and power, there’s a two-pin connection that should reduce the drive to 3 Gbps SATA operation instead of the default 6 Gbps. Internally, the drive is similar to others but stands out with the presence of iNAND for the OptiNAND technology. This is required for metadata in order to achieve maximum drive capacity and also for additional features — notably ArmorCache, which is only available on the 22TB and 24TB WD Gold HDDs. If the amount of NAND available for caching remains static between these two, it’s possible there could be minor performance impacts for the 24TB SKU.

We’ve covered WD’s OptiNAND technology thoroughly in our

WD Gold 22TB review

, but as a short refresher, it’s WD’s way of keeping up in the capacity chase. Certain data can be written to flash memory instead of the HDD platters, and as this is metadata, performance is also improved due to the flash’s superior random access performance. The flash is also non-volatile and allows the drive to be run with or without a write cache while having power loss protection even with the volatile cache enabled, as data can be flushed in time. This capability is known as ArmorCache and only applies to the 22TB and 24TB Gold. It’s the primary selling point in comparison to competing drives.