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| Brand | Samsung |
|---|---|
| Model | PM1635a |
| Capacity | 1.6TB |
| Usage Class | Enterprise |
| Host Interface | SAS 12Gb/s |
|---|---|
| Total Interface Bandwidth | 12 Gb/s |
| Form Factor | 2.5 |
|---|
| NAND Flash | Samsung V-NAND 3bit MLC (TLC) |
|---|---|
| Drive Writes Per Day | 3 |
| Total Bytes Written | 8760 TBW |
| Sequential Read | 1350 MB/s |
|---|---|
| Sequential Write | 1100 MB/s |
| Random Read IOPS | 190000 |
| Random Write IOPS | 35000 |
| Average Latency | 110 μs |
| Mean Time Between Failures | 2 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | Yes |
| MPN | MZILS1T6HEGR |
|---|
Compared with MZILS1T6HEGR, the Samsung PM1635a (MZ-ILS1T6B) is the next-generation 1.6TB 12Gb/s SAS SSD that pairs Samsung V-NAND 3-bit MLC with 1,350/1,100 MB/s sequential performance and 190,000/35,000 IOPS, delivering a stronger balance of throughput, endurance, and flash efficiency. Its 3 DWPD rating and 8,760 TBW make it a particularly solid upgrade for mixed-read/write virtualization, database, and enterprise RAID tiers that need SAS reliability without sacrificing usable write life.
With an endurance rating of 8,760 TBW and 3 DWPD, the MZ-ILS1T6B is designed for sustained enterprise write workloads over its service life. In practical terms, for typical OS, application, boot, logging, and mixed read/write infrastructure use, it can serve reliably as a system or workload drive for many years without endurance becoming a concern. For enterprise reliability, built-in power loss protection (PLP) helps preserve in-flight data and metadata during unexpected power interruptions, reducing the risk of corruption and unclean shutdown issues. Its 1.0E-17 UBER and 2 million-hour MTBF indicate a very low uncorrectable bit error rate and strong long-term operational stability, giving procurement teams added confidence for business-critical deployments.
1. The SAS interface integrates cleanly into dual-port enterprise storage backplanes, enabling high availability, predictable failover, and easier lifecycle management in mission-critical servers.
2. Its strong sequential read performance accelerates large-block workloads such as database backup, virtualization image loading, and analytics dataset streaming.
3. The drive’s high random read capability keeps response times stable under heavily concurrent OLTP, VDI, and metadata-intensive application workloads.
4. With enterprise write endurance rated for sustained daily overwrite cycles, it is well suited for write-active environments like logging, caching, and mixed-use transactional storage.
5. Samsung V-NAND 3-bit MLC delivers a practical balance of capacity efficiency, power-conscious operation, and enterprise-grade reliability, while the low typical latency helps reduce application wait time and improves QoS consistency.
Lower capacity reference: 800GB Higher capacity reference: 3.2TB At 1.6TB, the MZ-ILS1T6B sits in the sweet spot of the family. Compared with the 800GB model, it gives much more headroom for OS images, application growth, logs, and overprovisioning without forcing a step into high-capacity pricing. Compared with the 3.2TB option, it usually delivers the same enterprise-class read/write behavior and similar random IOPS while keeping acquisition cost and stranded capacity under better control. It is a strong fit for mid-scale virtualization clusters, such as shared boot and utility storage for about 40 to 60 virtual machines.
Q: Is MZ-ILS1T6B suitable for a write-heavy database server?
A: Yes. With 3 DWPD endurance, 8760 TBW, SAS 12Gb/s connectivity, and 110 µs typical latency, the MZ-ILS1T6B is well suited for write-intensive database and enterprise server workloads.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: This model is rated for 3 DWPD, meaning it can sustain about three full 1.6TB drive writes per day throughout its warranty period, consistent with its 8760 TBW endurance specification.
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 metadata during unexpected outages, reducing corruption risk and improving reliability for transactional, database, and enterprise workloads.
Q: What RAID level is recommended for this SSD?
A: RAID 10 is typically recommended for this SSD in performance-critical databases, as it balances speed, redundancy, and rebuild efficiency. RAID 1 or RAID 5 may suit capacity-focused deployments.