General

Brand	Samsung
Model	PM851
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	TLC
Drive Writes Per Day	0.16
Total Bytes Written	75 TBW

Performance

Sequential Read	540 MB/s
Sequential Write	270 MB/s
Random Read IOPS	90000
Random Write IOPS	45000
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-7TE2560

Engineer's Note

Compared with the earlier MZ-7TE2560, the MZ-7TE256D is the later 256GB PM851 revision, retaining the proven 540/270 MB/s SATA performance profile while providing a cleaner OEM refresh path with 90,000/45,000 IOPS and 75 TBW endurance in the same capacity point. Its strongest value versus peer SATA TLC drives is the balanced combination of client-class responsiveness and controlled write endurance, making it a solid fit for read-heavy notebook fleets, VDI boot images, and general-purpose OEM platforms.

Endurance & Reliability

With an endurance rating of 75 TBW and 0.16 DWPD, the MZ-7TE256D can comfortably support typical client or light-duty business workloads such as OS, office applications, and general data access for many years. In practical terms, when used as a boot or system drive rather than a heavy write-intensive storage device, this level of endurance is generally sufficient for long-term daily operation with ample margin. From a reliability standpoint, the drive is rated at 1.5 million hours MTBF and an UBER of 1.0E-15, meaning unrecoverable read errors are expected to be extremely rare under normal operating conditions. It does not include power-loss protection (PLP), so while it is a dependable choice for standard desktop or non-critical business use, systems requiring guaranteed in-flight write protection during sudden power failure should pair it with stable power infrastructure such as UPS support.

Technical Specs & Insights

1. The SATA interface makes this drive easy to deploy in mainstream enterprise servers and storage arrays, enabling low-risk upgrades without changing existing backplanes or controller ecosystems.
2. Its 540 MB/s sequential read performance accelerates boot storms, backup restores, and large-file access in virtualized and read-centric business workloads.
3. With 90,000 K IOPS random read capability, it can sustain responsive performance for metadata-heavy databases, VDI environments, and high-concurrency application servers.
4. The 0.16 DWPD endurance profile, paired with TLC NAND, is best suited for read-dominant enterprise use cases where cost efficiency matters more than intensive daily overwrite tolerance.
5. A typical latency of 50 µs helps reduce storage response time, supporting faster transaction handling and more consistent QoS for latency-sensitive enterprise applications.

Capacity Sweet

Lower capacity reference: 128GB Higher capacity reference: 512GB In this series, the 256GB model sits at the practical sweet spot. Compared with the 128GB version, it gives noticeably more headroom for OS images, logs, patches, and short-term workload growth, reducing the risk of early capacity pressure. Compared with the 512GB option, it keeps acquisition cost and fleet-wide budget under tighter control while delivering broadly similar enterprise-class sequential throughput and random IOPS. This makes 256GB especially well suited for mid-scale virtualization clusters, such as boot and utility storage for about 40 to 60 compact application servers.

FAQ