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| Brand | Samsung |
|---|---|
| Model | 840 PRO |
| Capacity | 256GB |
| Usage Class | Client |
| Host Interface | SATA |
|---|---|
| Total Interface Bandwidth | 6 Gb/s |
| Form Factor | 2.5 |
|---|
| NAND Flash | MLC |
|---|---|
| Drive Writes Per Day | 0.16 |
| Total Bytes Written | 73 TBW |
| Sequential Read | 540 MB/s |
|---|---|
| Sequential Write | 520 MB/s |
| Random Read IOPS | 100000 |
| Random Write IOPS | 90000 |
| Average Latency | 50 μs |
| Mean Time Between Failures | 1.5 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | No |
| MPN | MZ7PC256HAFV |
|---|
Compared with the previous-generation MZ7PC256HAFV, the MZ7PD256HCGM-1BW00 840 PRO delivers a clear SATA performance uplift, reaching 540/520 MB/s sequential throughput and 100,000/90,000 IOPS random performance for lower latency in mixed read/write workloads. Its 256GB MLC architecture and 73 TBW endurance also give it a more durable, performance-focused profile than the earlier model, making it a better fit for boot drives, engineering workstations, and write-active client tiers.
The rated endurance of 73 TBW means this 256GB SSD can sustain about 20GB of host writes per day for 10 years, which is more than sufficient for typical OS, boot, office, POS, and other read-heavy system-drive use cases. In practical procurement terms, this makes it a solid choice for light-write applications where daily write volume is modest and predictable. For reliability, the 1.5 million-hour MTBF and 1.0E-15 UBER indicate a mature drive platform with strong operational stability and a very low uncorrectable bit error rate, supporting dependable long-term data reads and normal business use. This model does not include power-loss protection, so it is best deployed in systems with stable power or higher-level backup safeguards rather than write-critical environments where in-flight data must be preserved during sudden outages.
1. The SATA interface, paired with near bus-saturating sequential read performance, makes this drive a practical drop-in upgrade for legacy enterprise platforms that need faster boot, imaging, and dataset streaming without changing server backplanes.
2. Its strong random read capability helps VDI, OLTP, and web-facing workloads return small-block data quickly under concurrency, improving VM density and application responsiveness.
3. The endurance profile is best aligned with read-centric enterprise use cases such as boot drives, content delivery, reference datasets, and analytics tiers where write pressure is relatively light.
4. MLC NAND provides better consistency and write resilience than TLC-based alternatives, making it a solid choice for businesses that prioritize predictable enterprise behavior over lowest-cost flash.
5. Low typical latency enables faster transaction turnaround and steadier QoS, which is especially valuable for latency-sensitive databases and virtualization clusters.
Lower capacity reference: 128GB Higher capacity reference: 512GB Within this enterprise SSD family, the 256GB model sits in the sweet spot for mainstream infrastructure builds. Compared with the 128GB option, it provides much better headroom for OS growth, logs, swap, patches, and application overhead, reducing the risk of early capacity pressure. Compared with the 512GB version, it delivers a more balanced acquisition cost while preserving essentially the same class of sequential and random performance for typical enterprise workloads. It is best suited for mid-scale deployments, such as boot and system volumes for about 40 to 60 virtualized application nodes.
Q: Is MZ7PD256HCGM-1BW00 suitable for a write-heavy database server?
A: Not ideally. Although it uses MLC NAND, its endurance is only 0.16 DWPD and 73 TBW, which is relatively low for write-heavy database workloads. It fits read-focused or light mixed-use servers better.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: Its rated endurance is 0.16 full drive writes per day. For a 256GB SSD, that equals about 41GB of writes daily on average, with a total endurance rating of 73 TBW.
Q: Does it include power loss protection (PLP) and why is that critical?
A: No, this model does not include power loss protection. PLP is critical in enterprise environments because it helps prevent in-flight data loss and metadata corruption during unexpected power failures.
Q: What RAID level is recommended for this SSD?
A: RAID 1 or RAID 10 is generally recommended. These levels provide redundancy and solid performance while avoiding the extra write penalty of parity RAID, which can further reduce SSD lifespan.