General

Brand	Samsung
Model	850 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	0.32
Total Bytes Written	150 TBW

Performance

Sequential Read	550 MB/s
Sequential Write	520 MB/s
Random Read IOPS	100000
Random Write IOPS	90000
Average Latency	50 μs

Reliability

Mean Time Between Failures	2 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	No

Part Number

MPN	MZ-7PD256

Engineer's Note

Compared with the MZ-7PD256, the MZ-7KE256 850 PRO advances to 3D MLC V-NAND, delivering substantially higher endurance at 150 TBW (0.32 DWPD) while maintaining top-tier SATA performance of up to 550/520 MB/s and 100,000/90,000 IOPS. This makes it the stronger choice for workstation boot drives, content-creation scratch space, and other write-heavy SATA deployments that need better lifespan and performance consistency than the previous generation.

Endurance & Reliability

With an endurance rating of 150 TBW and 0.32 DWPD, the MZ-7KE256 is well suited for typical OS, boot, and light-to-moderate business application workloads, where daily write volumes are usually far below its design limit. In practical terms, for use as a system drive or general office SSD, this endurance level can comfortably support many years of normal operation, including scenarios that average around 40 GB of writes per day over roughly 10 years. The drive’s UBER rating of 1.0E-15 reflects a strong data integrity level, meaning unrecoverable read errors are expected to be extremely rare in normal enterprise or commercial use, while the 2 million hour MTBF further supports long-term operational reliability. Although this model does not include power loss protection, which is mainly important for write-critical cache or transaction-heavy environments, it remains a dependable choice for stable systems with controlled shutdown practices and standard data protection measures.

Technical Specs & Insights

1. The SATA interface ensures broad drop-in compatibility with mainstream enterprise servers and storage arrays, making upgrades simple in legacy-heavy data center environments.
2. With sequential read performance of 550 MB/s, this drive accelerates bulk data access for boot volumes, log replay, and content delivery workloads.
3. Its random read capability of 100,000 K IOPS supports highly responsive performance in virtualized infrastructures and read-intensive database environments.
4. Rated at 0.32 DWPD and built on MLC V-NAND, it offers a balanced mix of write endurance and long-term data reliability for steady-state enterprise use.
5. A typical latency of 50 µs helps reduce storage wait time, improving application responsiveness for transactional and latency-sensitive services.

Capacity Sweet

Reference capacities in the same series: Lower capacity: 128GB Higher capacity: 512GB Capacity positioning analysis: Within this series, the 256GB model sits at the practical sweet spot. Compared with the 128GB version, it offers much more room for OS images, application stacks, logs, and growth headroom, reducing the risk of early capacity pressure in always-on environments. Compared with the 512GB model, it keeps acquisition cost and fleet-level budget under tighter control while delivering broadly similar sequential and random performance for typical enterprise SATA workloads. It is best suited for small-to-mid virtualization clusters, such as hosting boot and utility volumes for about 30 to 50 infrastructure-focused virtual machines.

FAQ