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| Brand | Samsung |
|---|---|
| Model | 840 |
| Capacity | 250GB |
| Usage Class | Client |
| Host Interface | SATA |
|---|---|
| Total Interface Bandwidth | 6 Gb/s |
| Form Factor | 2.5 |
|---|
| NAND Flash | TLC |
|---|---|
| Drive Writes Per Day | 0.16 |
| Total Bytes Written | 75 TBW |
| Sequential Read | 540 MB/s |
|---|---|
| Sequential Write | 250 MB/s |
| Random Read IOPS | 96000 |
| Random Write IOPS | 62000 |
| 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-7PC256 |
|---|
Compared with the MZ-7PC256, the Samsung 840 250GB (MZ-7TD250) increases sequential read performance from 520 to 540 MB/s and boosts random performance to 96,000/62,000 IOPS from roughly 80,000/36,000 IOPS, delivering a clear generational gain in boot, launch, and mixed client responsiveness. Its 75 TBW, 0.16 DWPD endurance profile and TLC NAND make it the stronger value choice for cost-optimized, read-heavy desktop and notebook SATA deployments, especially where lower cost per GB and higher peak read responsiveness matter more than the predecessor’s higher sustained write speed.
With an endurance rating of 75 TBW and 0.16 DWPD, the MZ-7TD250 is well suited for typical light-duty workloads such as OS boot, office applications, and general business PCs. In practical terms, this level of endurance is sufficient for many years of normal daily use, making it a dependable choice as a system drive under standard read/write patterns. The drive’s specified UBER of 1.0E-15 and MTBF of 1.5 million hours indicate a solid reliability baseline, helping ensure stable data integrity and long service life in everyday operation. While this model does not include power-loss protection, which is mainly important for write-critical enterprise applications, it remains an appropriate and trustworthy option for non-cache, non-transactional client and commercial environments backed by a 1-year warranty.
1. The SATA interface ensures broad compatibility with legacy enterprise backplanes and existing server platforms, making this drive a low-risk upgrade for modernizing installed storage fleets.
2. Its near-ceiling sequential read performance for the SATA bus helps accelerate boot storms, backup restores, and large-file delivery in read-focused business environments.
3. Strong random read capability enables faster response for virtual desktop images, metadata lookups, and heavily indexed databases under concurrent user access.
4. The modest endurance profile is best suited to read-centric enterprise workloads such as content serving, reference datasets, and boot volumes rather than sustained write-intensive logging or caching tiers.
5. TLC NAND balances cost, capacity, and efficiency well for mainstream enterprise deployments, while the low typical latency supports snappier application response and more predictable service times.
Lower capacity reference: 128GB Higher capacity reference: 500GB Capacity positioning analysis: Within the MZ-7TD family, the 250GB model sits at the practical sweet spot. Compared with the 128GB version, it gives meaningfully more headroom for OS images, logs, patch growth, and spare area, reducing day-to-day capacity pressure. Compared with the 500GB version, it delivers nearly the same enterprise-class sequential throughput and random IOPS profile while keeping acquisition cost and stranded capacity under better control. It is best suited for small to mid-sized virtualization clusters, such as hosting boot and utility volumes for about 40 to 60 lightweight virtual machines.
Q: Is MZ-7TD250 suitable for a write-heavy database server?
A: MZ-7TD250 is generally not recommended for write-heavy database servers. With TLC NAND, 0.16 DWPD, and 75 TBW, it is better suited for read-intensive or mixed-light enterprise workloads.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: This SSD is rated at 0.16 DWPD, meaning it can sustain about 0.16 full drive writes per day over its warranty period. For a 250GB model, that equals roughly 40GB daily.
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 server 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: For this SSD, RAID 1 or RAID 10 is typically recommended when data protection and performance consistency matter. RAID 5 or 6 may add extra write overhead on this endurance class.