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| Brand | Micron |
|---|---|
| Model | RealSSD P400e |
| Capacity | 400GB |
| Usage Class | Enterprise |
| Host Interface | SATA 6Gb/s |
|---|---|
| Total Interface Bandwidth | 6 Gb/s |
| Form Factor | 2.5" 7mm |
|---|
| NAND Flash | 25nm MLC |
|---|---|
| Drive Writes Per Day | 0.24 |
| Total Bytes Written | 175 TBW |
| Sequential Read | 350 MB/s |
|---|---|
| Sequential Write | 140 MB/s |
| Random Read IOPS | 50000 |
| Random Write IOPS | 75000 |
| Average Latency | μs |
| Mean Time Between Failures | 1.2 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | No |
The Micron RealSSD P400e 400GB (MTFDDAK400MAR) is best suited for read-intensive edge caching, web/content serving, and boot or metadata tiers in space-constrained SATA infrastructures, where its 50,000/75,000 random read/write IOPS and 25nm MLC NAND deliver stronger small-block responsiveness than typical entry enterprise SATA SSDs. With 175 TBW endurance, 0.24 DWPD, and a balanced 350/140 MB/s sequential profile, it offers a more dependable fit for light mixed-workload enterprise deployments than consumer-grade alternatives while preserving the simplicity and compatibility of SATA 6Gb/s platforms.
With an endurance rating of 175 TBW, the MTFDDAK400MAR is designed for read-intensive and light-to-moderate write workloads, equivalent to about 96 GB of writes per day over 5 years or roughly 48 GB per day over 10 years. In practical terms, this is well suited for use as an OS or boot drive, embedded system disk, or application drive where write activity is limited, providing long service life under typical operating conditions. From a reliability perspective, the specified UBER of 1.0E-15 means the drive is built to a high data-integrity standard, with an extremely low probability of an unrecoverable bit error during reads, which is in line with enterprise-class SSD expectations. This model does not include power-loss protection (PLP), so while it remains a solid choice for stable-power environments and read-centric deployments, systems with frequent sudden power interruptions or critical in-flight write protection requirements should pair it with appropriate power safeguards such as a UPS.
1. The SATA 6Gb/s interface ensures broad compatibility with mainstream enterprise backplanes and legacy server platforms, making it a low-risk upgrade for storage refresh projects.
2. The 350 MB/s sequential read performance supports fast boot, log replay, and efficient access to large static datasets in read-focused server environments.
3. With 50,000 random read IOPS, the drive can handle highly concurrent lookup-heavy workloads such as virtualization metadata, web serving, and indexed database queries with stable responsiveness.
4. The 0.24 DWPD endurance profile is best aligned with read-centric enterprise use cases, helping control storage cost in fleets where write intensity is moderate rather than constant.
5. Built on 25nm MLC NAND, the SSD offers a stronger balance of data retention, write endurance, and long-term reliability than consumer-grade flash for always-on business systems.
For MPN MTFDDAK400MAR, the nearest lower capacity in the same enterprise SSD family is 200GB, and the nearest higher capacity is 800GB. Capacity positioning analysis: In this series, the 400GB model sits at a practical sweet spot. Compared with the 200GB version, it gives meaningfully better capacity headroom for OS images, logs, metadata, and moderate application growth, reducing early replacement pressure. Compared with the 800GB version, it usually delivers the same class of enterprise read/write and random IOPS performance while keeping acquisition cost and cost-per-node more controlled. This makes 400GB especially well suited for mid-scale virtualization clusters, such as shared boot and utility storage for about 40 to 60 virtual machines.
Q: Is MTFDDAK400MAR suitable for a write-heavy database server?
A: Not ideally. With 0.24 DWPD, 175 TBW, and no power loss protection, this 400GB SATA SSD is better suited for read-intensive or mixed workloads than write-heavy database applications.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: Its endurance rating is 0.24 DWPD, meaning about 0.24 full 400GB drive writes per day during the warranty period. Based on 175 TBW, that equals roughly 437 total full-drive writes.
Q: Does it include power loss protection (PLP) and why is that critical?
A: No, this model does not include PLP. PLP is critical in enterprise environments because it helps protect in-flight data and mapping tables during sudden power loss, reducing corruption risk.
Q: What RAID level is recommended for this SSD?
A: RAID 1 or RAID 10 is generally recommended, depending on capacity and performance needs. These levels provide stronger redundancy and better write behavior than RAID 5 or RAID 6.