General

Brand	Samsung
Model	860 PRO
Capacity	256GB
Usage Class	Client

Interface

Host Interface	SATA
Total Interface Bandwidth	6 Gb/s

Physical Dimension

Form Factor	2.5

Flash & Endurance

NAND Flash	MLC V-NAND
Drive Writes Per Day	0.64
Total Bytes Written	300 TBW

Performance

Sequential Read	560 MB/s
Sequential Write	530 MB/s
Random Read IOPS	100000
Random Write IOPS	90000
Average Latency	50 μs

Reliability

Mean Time Between Failures	1.5 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	No

Part Number

MPN	MZ-75B256

Engineer's Note

Compared with the previous-generation MZ-75B256, the MZ7KH256HAHQ 860 PRO 256GB moves to a higher-endurance MLC V-NAND design rated for 300 TBW / 0.64 DWPD while sustaining near-SATA-limit performance at 560/530 MB/s and 100,000/90,000 IOPS. This makes it a stronger choice for write-intensive OS, database log, and edge-cache boot workloads where longer service life and steadier low-queue-depth responsiveness matter more than raw capacity.

Endurance & Reliability

With an endurance rating of 300 TBW and 0.64 DWPD, the MZ7KH256HAHQ can sustain about 300 terabytes of total host writes over its warranty life, which is more than sufficient for typical OS, boot, and read-heavy application workloads. In practical terms, for a 256GB system drive used in standard enterprise PCs, thin clients, or server boot scenarios, this level of endurance supports many years of normal daily operation without endurance concern. From a reliability perspective, the specified UBER of 1.0E-15 and MTBF of 1.5 million hours indicate enterprise-class data integrity and long-term operational stability under normal conditions. This model does not include power-loss protection, so it is best suited for environments with stable power or upstream system-level protection such as UPS, while still providing dependable performance for non-write-cache-critical use cases.

Technical Specs & Insights

1. The SATA interface, paired with up to 560 MB/s sequential read speed, makes this drive a practical drop-in upgrade for enterprise boot, logging, and read-centric application tiers where compatibility and predictable throughput matter more than PCIe-class bandwidth.
2. With 100,000 random read IOPS, it can sustain responsive access to heavily indexed databases, virtual machine images, and metadata-heavy workloads under concurrent user demand.
3. Rated at 0.64 DWPD, the drive is best aligned with mixed-use enterprise deployments that need dependable daily write capability without the cost profile of high-end write-intensive SSDs.
4. Its MLC V-NAND architecture provides a strong balance of endurance, performance consistency, and data retention, making it well suited for business-critical environments that prioritize reliability over low-cost flash.
5. A typical latency of 50 µs helps reduce storage wait time at the application layer, improving transaction responsiveness and overall quality of service in latency-sensitive server workloads.

Capacity Sweet

For the Samsung MZ7KH256HAHQ 256GB enterprise SSD, the closest lower-capacity reference in the same family is 128GB, and the next higher-capacity reference is 512GB. In this series, sequential read/write behavior and random IOPS are typically kept in the same enterprise-class range, so capacity choice is mainly about usable space, endurance headroom, and budget efficiency. At 256GB, this model sits at the sweet spot of the lineup. Compared with the 128GB version, it offers much better space flexibility for OS images, logs, swap, and application growth without changing the expected enterprise performance profile. Compared with the 512GB model, it delivers a more balanced cost-per-drive while still providing enough room for practical consolidation. It is especially well suited for small to mid-sized virtualization clusters, such as hosting boot volumes and utility workloads for around 40 to 60 light virtual machines.

FAQ