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| Brand | Samsung |
|---|---|
| Model | PM991 |
| Capacity | 512GB |
| Usage Class | Client |
| Host Interface | NVMe |
|---|---|
| Total Interface Bandwidth | 32 Gb/s |
| Form Factor | M.2 |
|---|
| NAND Flash | TLC V-NAND |
|---|---|
| Drive Writes Per Day | 0.3 |
| Total Bytes Written | 300 TBW |
| Sequential Read | 2200 MB/s |
|---|---|
| Sequential Write | 1200 MB/s |
| Random Read IOPS | 250000 |
| Random Write IOPS | 250000 |
| 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 | PM981 |
|---|
Compared with the PM981, the PM991 L65188-002 delivers a more balanced next-generation client NVMe profile, combining 512GB of TLC V-NAND with 300 TBW / 0.3 DWPD endurance and up to 2200/1200 MB/s sequential throughput plus 250,000/250,000 IOPS. Its unique value is giving OEM notebooks and desktop boot drives a stronger endurance-per-watt and cost-efficient mainstream performance point than the PM981, making it a better fit for high-volume client deployments that need reliable daily write tolerance without moving to a higher-cost SSD tier.
With an endurance rating of 300 TBW and 0.3 DWPD, this SSD is well suited for typical OS, office, and general business workloads where daily write volumes are moderate. In practical terms, for use as a system or boot drive, 300 TBW provides a comfortable endurance margin for many years of normal operation, helping procurement teams deploy it with confidence in standard commercial environments. Its 1.0E-15 UBER specification means the drive is designed to maintain a very low rate of unrecoverable bit errors, supporting dependable data integrity in everyday operation, while the 1.5 million-hour MTBF further reflects solid long-term reliability expectations. This model does not include power-loss protection (PLP), so it is best positioned for client and non-write-critical business applications rather than environments that require in-flight write protection during sudden power interruption.
1. The NVMe interface unlocks deep parallelism and low software overhead, helping enterprise platforms remove storage bottlenecks in virtualized, database, and scale-out server environments.
2. Sequential read performance of 2200 MB/s speeds up large-file ingestion, VM image loading, and backup recovery, reducing wait time for data-heavy business operations.
3. Random read capability of 250,000 K IOPS keeps transactional databases, VDI pools, and metadata-intensive applications responsive even under highly concurrent access patterns.
4. An endurance rating of 0.3 DWPD is well aligned with read-centric enterprise workloads, offering a practical balance between usable capacity, acquisition cost, and service life.
5. TLC V-NAND combined with a typical latency of 50 µs delivers cost-efficient enterprise flash with consistently fast response times for latency-sensitive application reads.
Lower capacity reference: 480GB Higher capacity reference: 960GB In this enterprise SSD family, the 512GB model sits at the practical sweet spot. Compared with the 480GB option, it gives noticeably more headroom for OS images, application growth, logs, and overprovisioning flexibility, reducing the risk of early capacity pressure. Compared with the 960GB version, it keeps acquisition cost and fleet-wide budget under tighter control while delivering essentially similar sequential throughput and random IOPS for mainstream enterprise workloads. It is especially well suited for medium-scale virtualization clusters, such as shared boot and application storage for around 30 to 50 business workloads.
Q: Is L65188-002 suitable for a write-heavy database server?
A: L65188-002 is generally not ideal for a write-heavy database server. With 0.3 DWPD, 300 TBW, TLC V-NAND, and no PLP, it is better suited for read-centric or mixed workloads.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: This SSD is rated for 0.3 DWPD, meaning about 30% of its 512GB capacity can be written daily over the warranty period. That equals roughly 154GB of writes per day.
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 enterprise environments because it helps prevent in-flight data loss and metadata corruption during sudden power interruptions.
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 choice still depends on workload, capacity targets, and acceptable fault tolerance.