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| Brand | Samsung |
|---|---|
| Model | PM1635a |
| Capacity | 1.6 TB |
| Usage Class | Mixed Use |
| Host Interface | SAS 12Gb/s |
|---|---|
| Total Interface Bandwidth | 12 Gb/s |
| Form Factor | 2.5 |
|---|
| NAND Flash | Samsung V-NAND 3D TLC |
|---|---|
| Drive Writes Per Day | 3 |
| Total Bytes Written | 8760 TBW |
| Sequential Read | 1300 MB/s |
|---|---|
| Sequential Write | 1250 MB/s |
| Random Read IOPS | 200000 |
| Random Write IOPS | 50000 |
| Average Latency | 115 μs |
| Mean Time Between Failures | 2 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | Yes |
| MPN | MZILS1T6HCJM-00007 |
|---|
Compared with the earlier MZILS1T6HCJM-00007, the Samsung PM1635a (MZILS1T6HEJH-000D3) delivers a clear generational step forward with a newer 12Gb/s SAS enterprise platform, sustaining 1300/1250 MB/s and 200K/50K IOPS while maintaining a robust 3 DWPD and 8,760 TBW at 1.6 TB. Its standout value is the combination of Samsung V-NAND 3D TLC efficiency and high write endurance, making it a stronger fit than the prior generation for latency-sensitive virtualized databases, mixed-read/write OLTP, and 24/7 enterprise server tiers that need SAS reliability without sacrificing usable endurance.
With an endurance rating of 8,760 TBW and 3 DWPD, the MZILS1T6HEJH-000D3 is built for sustained enterprise write workloads over its full service life. In practical terms, this level of endurance is far beyond typical OS boot or read-heavy application usage, so it can serve as a system drive for many years with substantial margin under normal data center conditions. For enterprise reliability, power loss protection (PLP) helps preserve in-flight data and metadata during an unexpected power interruption, reducing the risk of corruption and improving operational stability. Its 1.0E-17 UBER and 2 million hour MTBF indicate an enterprise-class design focused on very low uncorrectable error rates and dependable long-term operation, giving procurement teams confidence for business-critical deployments.
1. The SAS interface brings seamless compatibility with enterprise backplanes, RAID controllers, and dual-port high-availability storage designs, making deployment straightforward in mission-critical server environments.
2. Its strong sequential read bandwidth speeds up backup restores, large-file analytics, and full-table database scans, helping reduce data access bottlenecks in throughput-heavy workloads.
3. The high random read capability, paired with low typical latency, keeps transactional databases, virtual desktop pools, and metadata-intensive applications highly responsive under mixed read pressure.
4. A 3 DWPD endurance rating makes it well suited for write-intensive enterprise use cases such as logging, caching, and continuously updated business-critical datasets.
5. Samsung V-NAND 3D TLC provides a balanced mix of capacity, efficiency, and reliability, enabling lower total cost of ownership without sacrificing enterprise-class flash performance.
Lower capacity: 800 GB Higher capacity: 3.2 TB At 1.6 TB, this model sits in the sweet spot of the series. Compared with the 800 GB version, it gives much better headroom for OS images, application growth, log retention, and spare capacity, reducing the risk of early overprovisioning pressure. Compared with the 3.2 TB option, it keeps acquisition cost and power budget more controlled while delivering essentially the same enterprise-class sequential and random I/O behavior. It is a strong fit for mid-sized virtualization clusters, such as shared boot and application storage for about 40-60 general-purpose virtual machines.
Q: Is MZILS1T6HEJH-000D3 suitable for a write-heavy database server?
A: Yes. With 3 DWPD, 8760 TBW, SAS 12Gb/s, and low 115 µs typical latency, this 1.6 TB Samsung enterprise SSD is well suited for write-intensive database workloads.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: It is rated for 3 full drive writes per day. For a 1.6 TB SSD, that equals about 4.8 TB of writes daily across the standard warranty period.
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, which is critical for data integrity, consistency, and enterprise system reliability.
Q: What RAID level is recommended for this SSD?
A: RAID 10 is typically recommended for performance-sensitive and write-heavy environments, such as databases. RAID 1 or RAID 5 may also fit, depending on your balance of performance, redundancy, and capacity.