General

Brand	Micron
Model	RealSSD P400m
Capacity	400GB
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	10
Total Bytes Written	7300 TBW

Performance

Sequential Read	350 MB/s
Sequential Write	300 MB/s
Random Read IOPS	55000
Random Write IOPS	50000
Average Latency	μs

Reliability

Mean Time Between Failures	2 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	Yes

Engineer's Note

The Micron RealSSD P400m 400GB (MTFDDAK400MAN-2S1AA) is purpose-built for write-intensive enterprise workloads such as database logging, virtualization journals, and caching tiers, delivering 10 DWPD and 7.3PB TBW—substantially higher endurance than typical read-centric SATA SSDs in the same class. With 2D MLC NAND, steady 350/300 MB/s throughput, and up to 55K/50K random IOPS on a SATA 6Gb/s interface, it is a strong fit for legacy server platforms that need enterprise-grade consistency and endurance without moving to PCIe.

Endurance & Reliability

With an endurance rating of 7,300 TBW and 10 DWPD, the MTFDDAK400MAN-2S1AA is designed for intensive write-heavy enterprise workloads and provides substantial lifetime headroom in typical server use. In practical terms, for common OS, boot, logging, and mixed application workloads, this level of endurance means the drive can serve reliably for many years without endurance becoming a concern. Enterprise reliability is further strengthened by built-in Power Loss Protection (PLP), which helps preserve in-flight data and protect metadata integrity if power is interrupted unexpectedly. Its UBER of 1.0E-16 indicates a very low unrecoverable bit error rate, supporting high data integrity expectations in business-critical environments.

Technical Specs & Insights

1. The SATA interface ensures broad drop-in compatibility with mainstream enterprise servers and storage arrays, simplifying refresh projects without requiring PCIe infrastructure changes.
2. Its sustained sequential read performance helps accelerate boot images, media streaming, backup restores, and other read-heavy data flows in legacy enterprise platforms.
3. Strong random read capability enables faster response for OLTP databases, virtual desktop environments, and metadata-intensive workloads where small-block access dominates.
4. The high endurance rating makes it well suited for write-intensive enterprise use cases such as logging, caching, and mixed-workload virtualization that demand predictable lifespan under constant rewrites.
5. MLC NAND provides a balanced enterprise profile of endurance, consistency, and data retention, making it a dependable choice for mission-critical deployments that prioritize reliability over peak density.

Capacity Sweet

Reference capacities in the same family: Lower capacity: 200GB Current model: 400GB Higher capacity: 800GB Typical enterprise-class performance positioning for all three capacities: Sequential read: about 500-540 MB/s Sequential write: about 330-520 MB/s Random read IOPS: about 85K-95K Random write IOPS: about 30K-75K Note: In this series, performance is generally very close across nearby capacities, with capacity and endurance being the main differentiators. Capacity positioning analysis: In this series, the 400GB model sits at the sweet spot. Compared with the 200GB option, it provides much better headroom for OS images, logs, swap space, and application growth, reducing early capacity pressure. Compared with the 800GB version, it usually delivers the best balance between acquisition cost, usable flash, and enterprise-grade performance that remains broadly similar across capacities. It is especially well suited for small to mid-sized virtualization clusters, such as hosting boot and utility volumes for about 30 to 50 infrastructure-focused virtual machines.

FAQ