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| Brand | Micron |
|---|---|
| Model | S655DC |
| Capacity | 400GB |
| Usage Class | Enterprise |
| Host Interface | SAS 12Gb/s |
|---|---|
| Total Interface Bandwidth | 12 Gb/s |
| Form Factor | 2.5" 7mm |
|---|
| NAND Flash | 16nm MLC |
|---|---|
| Drive Writes Per Day | 25 |
| Total Bytes Written | 17000 TBW |
| Sequential Read | 1700 MB/s |
|---|---|
| Sequential Write | 850 MB/s |
| Random Read IOPS | 200000 |
| Random Write IOPS | 12000 |
| Average Latency | 115 μs |
| Mean Time Between Failures | 2.5 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | Yes |
The Micron S655DC 400GB (MTFDJAK400MBW-2AN1ZABYY) is purpose-built for write-intensive enterprise workloads such as database redo/transaction logs, metadata journaling, and high-churn virtualization tiers, combining 25 DWPD endurance and 17,000 TBW with the predictable dual-port reliability of SAS 12Gb/s. Compared with typical read-centric or mixed-use SSDs in the same capacity class, its 16nm MLC design and 1700/850 MB/s throughput deliver substantially higher sustained write resilience and service-life stability where endurance—not just peak IOPS—is the deciding factor.
With an endurance rating of 17,000 TBW and 25 DWPD, the MTFDJAK400MBW-2AN1ZABYY is built for extremely write-intensive enterprise use and can comfortably handle many years of typical system, logging, cache, or mixed server workloads. In practical terms, for normal OS and application drive usage, this level of endurance is far beyond expected write demand and supports long-term deployment with substantial margin, making 10-year equivalent write stress for a system disk a very manageable scenario. This drive also includes power-loss protection (PLP), which helps preserve in-flight data and metadata during sudden power interruptions, reducing the risk of corruption and improving operational stability in enterprise environments. Its UBER of 1.0E-17 indicates an exceptionally low uncorrectable bit error rate, supporting high data integrity, while the 2.5 million hour MTBF further reflects a design focused on dependable continuous operation.
1. The SAS 12Gb/s interface ensures broad compatibility with dual-controller enterprise storage backplanes, enabling reliable high-availability deployment in mission-critical servers and arrays.
2. The 1700 MB/s sequential read speed accelerates large-block data access, reducing backup, restore, and analytics job completion time in data-intensive environments.
3. The 200,000 K IOPS random read capability sustains fast response under highly concurrent small-block workloads, making it well suited for virtualization, OLTP, and metadata-heavy applications.
4. With 25 DWPD backed by 16nm MLC NAND, this drive is built for extremely write-intensive enterprise workloads, supporting sustained logging, caching, and database updates with long-term endurance.
5. The 115 µs typical latency helps minimize storage wait time, improving transaction consistency and application responsiveness in latency-sensitive production systems.
Lower-capacity reference: 200GB Higher-capacity reference: 800GB In this enterprise SSD family, 400GB is the sweet-spot capacity. Compared with the 200GB model, it gives materially better headroom for OS images, logs, metadata, and short-term growth, reducing the risk of early capacity pressure in always-on environments. Compared with the 800GB version, it keeps acquisition cost and replacement budget tighter while delivering essentially the same mainstream enterprise read/write and random IOPS profile. This makes 400GB a balanced choice for medium-scale deployments, such as a 12-node virtualization cluster or a compact database and application tier.
Q: Is MTFDJAK400MBW-2AN1ZABYY suitable for a write-heavy database server?
A: Yes. With 25 DWPD endurance, 17,000 TBW, 16nm MLC NAND, and 115 µs typical latency, this SSD is well suited for write-intensive database, logging, and enterprise transaction workloads.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: It is rated for 25 full drive writes per day. For a 400GB model, that equals about 10TB of writes daily, making it appropriate for sustained heavy-write enterprise applications.
Q: Does it include power loss protection (PLP) and why is that critical?
A: Yes, it includes power loss protection. PLP helps preserve in-flight data and mapping tables during unexpected outages, reducing corruption risk and improving reliability in servers, RAID arrays, and databases.
Q: What RAID level is recommended for this SSD?
A: RAID 10 is generally recommended for this SSD in performance-critical environments, as it balances high write performance, low latency, and strong redundancy. RAID 1 or RAID 5 depends on capacity priorities.