General

Brand	Micron
Model	RealSSD P400e
Capacity	256GB
Usage Class	Enterprise

Interface

Host Interface	SATA 6Gb/s
Total Interface Bandwidth	6 Gb/s

Physical Dimension

Form Factor	2.5" 7mm

Flash & Endurance

NAND Flash	2D MLC
Drive Writes Per Day
Total Bytes Written	175 TBW

Performance

Sequential Read	350 MB/s
Sequential Write	140 MB/s
Random Read IOPS	50000
Random Write IOPS	7500
Average Latency	μs

Reliability

Mean Time Between Failures	1.2 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	No

Engineer's Note

The Micron RealSSD P400e 256GB (MTFDDAK256MAR-1K1AA) is best suited for read-centric embedded and edge-server workloads such as boot, logging, and content caching, where its 2D MLC NAND and 175 TBW deliver stronger write endurance and steadier long-term reliability than typical client-grade SATA SSDs. With SATA 6Gb/s connectivity, up to 350/140 MB/s sequential performance, and 50,000/7,500 IOPS, it provides a balanced, enterprise-oriented profile for systems that need predictable latency and durable operation rather than peak burst throughput.

Endurance & Reliability

With an endurance rating of 175 TBW, the MTFDDAK256MAR-1K1AA can sustain about 175 terabytes of total writes over its service life, which is more than sufficient for typical OS, boot, application, and read-heavy workload scenarios. In practical terms, for a 256GB system drive, this level of endurance is well suited for long-term everyday use and can comfortably support many years of normal deployment without endurance becoming a concern. From a reliability standpoint, the specified UBER of 1.0E-15 indicates a very low unrecoverable bit error rate, helping ensure strong data integrity during normal operation and aligning with expectations for dependable SSD performance. This model does not include power-loss protection (PLP), so while it remains a solid choice for system boot and standard workloads, environments with sudden power interruption risk for in-flight write data should use appropriate system-level safeguards such as a stable power design or UPS support.

Technical Specs & Insights

1. The SATA interface ensures broad server and storage-array compatibility, enabling cost-efficient upgrades without changing existing backplane infrastructure.
2. Its sequential read performance accelerates boot storms, large file retrieval, and backup restore operations in read-focused enterprise environments.
3. Strong random read capability helps databases and virtualized workloads sustain responsive access under high-concurrency small-block traffic.
4. The combination of enterprise write endurance and 2D MLC NAND provides the reliability needed for long-life deployment in mixed-use and write-sensitive applications.
5. Microsecond-class typical latency supports more predictable application response times, which is critical for transactional systems and service-level consistency.

Capacity Sweet

For the same series, the nearest lower capacity is 128GB, and the nearest higher capacity is 512GB. In this family, sequential read/write performance and random IOPS are typically very close across these capacities under normal enterprise workloads. The 256GB model sits at the sweet spot of the lineup. Compared with 128GB, it gives much better headroom for OS images, logs, patches, and application growth, reducing early capacity pressure. Compared with 512GB, it delivers a more attractive cost-to-performance balance when high endurance-class behavior matters more than raw space. It is especially well suited for boot and utility storage across a 24-node virtualization or container platform.

FAQ