WD Ultrastar DC HC560 20 TB Internal Hard Drive - Enterprise Capacity

Our review of the WD Ultrastar DC HC560 20 TB hard drive finds it best suited for enterprise and prosumer storage arrays that need very high capacity in a standard 3.5' form factor. The single biggest reason to buy is its combination of proven HelioSeal design and enterprise HDD technologies, which deliver large, power-efficient capacity and long projected service life for data centers or large-scale backups. This review examines real-world strengths and the trade-offs to consider before deploying it in servers or NAS systems.

Key Features

• 20 TB capacity: Provides very high storage density in a 3.5' drive for consolidating cold or warm data on fewer spindles.
• ePMR & CMR technology: Uses conventional magnetic recording to maintain compatibility with enterprise applications and avoids the write behavior issues associated with some high-density SMR drives.
• 7th generation HelioSeal: Helium sealing lowers power draw and improves thermal stability, which helps reduce cooling and operating costs in multi-drive enclosures.
• Advanced HDD tech: Includes OptiNAND, EAMR and TSA innovations that boost reliability and performance under sustained workloads in data center environments.
• Strong reliability and warranty: Rated for about 2.5M hours MTBF and backed by a 5-year limited warranty for long-term deployments.

Who It's For

The Ultrastar DC HC560 is aimed at IT administrators, storage architects and serious prosumers who need dense, reliable spinning-disk capacity for archival, backup, object storage or cold tier workloads. It fits in 3.5' bays and is appropriate for rackmount servers, storage arrays and large NAS systems that expect steady sustained transfers rather than laptop-style intermittent use.

Those who need the absolute fastest NVMe-class performance or ultra-low latency for transactional databases should look elsewhere; this drive is optimized for capacity, reliability and power efficiency rather than SSD-style random IOPS. Home users with modest storage needs may also find the physical size and enterprise focus unnecessary.

Pros & Cons

Pros

• Very high 20 TB capacity per 3.5' drive reduces rack space and total system complexity.
• Enterprise-focused features like OptiNAND and TSA improve sustained performance and drive resilience under load.
• HelioSeal design and efficient mechanics lower power consumption for large arrays.
• Five-year warranty and a high MTBF rating support long-term deployments.

Cons

• Some customers report mixed experiences with noise and perceived speed compared with expectations for specific setups.
• As a mechanical HDD, it cannot match SSD random I/O or latency for demanding transactional applications.

Specifications

Form factor	3.5 in internal
Capacity	20 TB
Interface	SATA [SATA/600]
Recording method	Conventional Magnetic Recording (CMR) with ePMR
Technology highlights	OptiNAND, EAMR, TSA, HelioSeal
Reliability	~2.5M hours MTBF (projected) and 5-year limited warranty

Our Verdict

The Ultrastar DC HC560 20 TB is a solid choice for enterprises and prosumers who need dense, reliable bulk storage with good power efficiency. It offers excellent value for large-capacity arrays and backups, though buyers should accept the trade-offs of mechanical drive noise and lower random IOPS compared with SSDs.

Frequently Asked Questions

Is this drive suitable for NAS and server arrays?
Yes. Its 3.5' form factor, SATA interface and enterprise-focused features make it suitable for NAS and rackmount storage arrays designed for high-capacity use.

Does it use SMR or CMR?
The drive uses Conventional Magnetic Recording (CMR) with ePMR, which is preferred for enterprise compatibility and predictable write performance.

What warranty and reliability assurances are provided?
Western Digital specifies a projected MTBF of about 2.5M hours and includes a 5-year limited warranty for the model.