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| Brand | Samsung |
|---|---|
| Model | 840 PRO |
| 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 | 97000 |
| 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 | MZ-7PC128 |
|---|
The Samsung 840 PRO 128GB (MZ-7PD128) is a strong SATA upgrade for latency-sensitive boot, application, and read-heavy workstation workloads, combining MLC NAND with 530/390 MB/s sequential throughput and 97,000/90,000 IOPS random performance in a compact 128GB footprint. Compared with the previous-generation MZ-7PC128, it delivers a clear generational uplift in write-side performance—up to 390 MB/s sequential write and 90,000 random write IOPS—making it notably better suited for OS, scratch, and small-block transactional workloads while sustaining 36 TBW endurance.
With an endurance rating of 36 TBW and 0.16 DWPD, the MZ-7PD128 is well suited for light-duty, read-focused workloads such as an OS boot drive, thin client, or embedded system disk. In practical terms, under typical system-drive usage with modest daily writes, it can comfortably support long-term deployment, including many years of service in stable operating conditions. From a reliability perspective, the drive’s 1.5 million-hour MTBF and 1.0E-15 UBER indicate solid overall component reliability and a very low rate of unrecoverable bit errors during reads. This model does not include power-loss protection, so it is best deployed in systems with stable power or UPS backup where sudden outages are unlikely, especially if write caching or critical in-flight data protection is a concern.
1. The SATA interface, paired with near-bus-limit sequential read performance, makes this drive a practical drop-in upgrade for legacy enterprise servers that need faster boot, restore, and large-file streaming without changing the storage backplane.
2. Its strong random read capability helps virtualization clusters, metadata-heavy applications, and read-centric databases serve far more small-block requests with lower queue buildup during peak demand.
3. The modest DWPD rating indicates it is best suited for read-heavy enterprise workloads such as boot volumes, reference datasets, and content delivery tiers rather than sustained write-intensive logging or OLTP environments.
4. Built on MLC NAND, the drive offers a better balance of consistency, endurance, and data integrity than consumer-oriented flash, making it a safer fit for business systems that require predictable long-term behavior.
5. The very low typical latency improves application responsiveness and tail-latency stability, which is especially valuable for transactional services and VMs that are sensitive to storage wait time.
Lower capacity reference: 64GB Higher capacity reference: 256GB In this series, the 128GB model is the practical sweet spot. Compared with the 64GB version, it offers noticeably better headroom for OS images, logs, patches, and application growth, reducing the risk of early capacity pressure. Compared with the 256GB option, it keeps acquisition cost and replacement budget under tighter control while delivering essentially the same enterprise-class sequential throughput and random IOPS profile. This makes 128GB especially well suited for compact virtualization clusters, branch-office servers, or about 40 to 60 lightweight VDI or infrastructure boot volumes.
Q: Is MZ-7PD128 suitable for a write-heavy database server?
A: No. MZ-7PD128 is better suited for read-centric or light mixed workloads. Its 0.16 DWPD, 36 TBW endurance, and lack of PLP make it a poor fit for write-heavy database servers.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: It is rated for about 0.16 full drive writes per day over its warranty life. For 128GB capacity, that equals roughly 20GB of writes daily, aligning with the 36TB TBW rating.
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 because it helps preserve in-flight data and SSD metadata during sudden outages, reducing corruption and consistency risks.
Q: What RAID level is recommended for this SSD?
A: RAID 1 or RAID 10 is generally recommended. These levels provide stronger redundancy and recovery performance, while avoiding the extra write penalty that RAID 5 or RAID 6 can introduce.