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| Brand | Samsung |
|---|---|
| Model | SM841 |
| Capacity | 128GB |
| 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 | 36 TBW |
| Sequential Read | 530 MB/s |
|---|---|
| Sequential Write | 390 MB/s |
| Random Read IOPS | 96000 |
| Random Write IOPS | 85000 |
| 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 | MZ7PC128HAFV |
|---|
The Samsung SM841 128GB (MZ7PD128HAFV-000H7) combines near–SATA-limit sequential read performance at 530 MB/s with 96,000/85,000 IOPS random read/write capability, giving it a clear edge for latency-sensitive boot, caching, and read-optimized application tiers where consistent MLC behavior matters more than raw capacity. Compared with the previous-generation MZ7PC128HAFV, this model offers a stronger balance of enterprise random I/O performance and endurance—36 TBW at 0.16 DWPD—making it a more capable choice for read-centric server deployments that need predictable SATA SSD responsiveness.
With an endurance rating of 36 TBW and 0.16 DWPD, this 128GB SSD is well suited for light write, read-centric usage such as OS boot, application loading, and general office workloads. In practical terms, that equates to roughly 20GB of host writes per day over five years, making it a dependable choice for use as a system drive under typical client or embedded operating conditions. From a reliability perspective, the specified UBER of 1.0E-15 means the drive is designed for a very low unrecoverable bit error rate, supporting stable long-term data reads in normal operation, while the 1.5 million hour MTBF further reflects solid hardware reliability. This model does not include power-loss protection, so it is best deployed in systems with controlled shutdown behavior or upstream power backup, where its reliability profile remains appropriate for non-write-critical applications.
1. The SATA interface makes this drive a practical drop-in upgrade for legacy enterprise servers and storage arrays, improving performance without requiring a platform redesign.
2. Its sequential read capability helps accelerate boot volumes, log scanning, and large file retrieval in read-heavy business environments.
3. Strong random read performance supports virtualization, OLTP databases, and metadata-intensive workloads by reducing storage bottlenecks under highly concurrent access.
4. The endurance rating is best suited to read-centric enterprise deployments such as content delivery, operating system images, and analytics repositories with limited daily write pressure.
5. MLC NAND combined with low typical latency provides a balanced mix of enterprise-grade reliability and consistently fast response times for latency-sensitive applications.
Lower capacity reference: 64GB Higher capacity reference: 256GB In this enterprise SSD family, the 128GB model sits at the practical sweet spot. Compared with the 64GB version, it gives much more headroom for OS images, logs, swap, metadata, and application growth, reducing early capacity pressure in always-on environments. Compared with the 256GB option, it keeps acquisition cost and fleet-level budget tighter while delivering broadly similar enterprise-class sequential throughput and random IOPS. This makes 128GB a balanced choice for medium-scale deployments, such as boot and service drives for roughly 30 to 50 virtualization hosts or edge application nodes.
Q: Is MZ7PD128HAFV-000H7 suitable for a write-heavy database server?
A: Not ideal for write-heavy database workloads. With 0.16 DWPD and 36 TBW, this 128GB SATA SSD is better suited to light-write, read-focused, or mixed workloads rather than intensive transactional databases.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: It is rated for approximately 0.16 full drive writes per day. For a 128GB SSD, that equals about 20GB of writes daily on average across its supported warranty endurance period.
Q: Does it include power loss protection (PLP) and why is that critical?
A: No, it does not include power loss protection. PLP is critical in enterprise environments because it helps prevent in-flight data loss and reduces metadata or file system corruption during sudden outages.
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 improve redundancy and availability, which is especially important since this model does not have PLP.