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| Brand | Samsung |
|---|---|
| Model | PM9A1a |
| Capacity | 1 TB |
| Usage Class | Client / OEM |
| Host Interface | PCIe 4.0 x4 |
|---|---|
| Total Interface Bandwidth | 16 Gb/s |
| Form Factor | M.2 (2280) |
|---|
| NAND Flash | Samsung V-NAND 7th Gen TLC |
|---|---|
| Drive Writes Per Day | 0.3 |
| Total Bytes Written | 600 TBW |
| Sequential Read | 7000 MB/s |
|---|---|
| Sequential Write | 5100 MB/s |
| Random Read IOPS | 1000000 |
| Random Write IOPS | 850000 |
| Average Latency | 60 μs |
| Mean Time Between Failures | 1.5 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | No |
| MPN | MZ-WLO7T60 |
|---|
Compared with the previous-generation MZ-WLO7T60, the Samsung PM9A1a (MZVL21T0HDLU-00B07) moves this 1 TB class to PCIe 4.0 x4 performance, delivering up to 7000/5100 MB/s sequential throughput and 1,000,000/850,000 IOPS for substantially stronger bandwidth and random I/O headroom. Built on Samsung 7th Gen V-NAND TLC with 600 TBW at 0.3 DWPD, it is a well-balanced choice for high-end client boot drives, content-creation workstations, and read-intensive edge systems that need near-flagship speed without sacrificing endurance predictability.
With an endurance rating of 600 TBW and 0.3 DWPD, this 1TB SSD is well suited for typical boot, office, and read-centric business workloads, and it can comfortably handle about 164 GB of host writes per day over 10 years. In practical terms, for use as an OS or general-purpose system drive, this level of endurance provides ample write headroom for long-term daily operation. For reliability, the UBER rating of 1.0E-15 means the drive is designed for a very low rate of unrecoverable read errors, supporting strong data integrity in normal enterprise use, while the 1.5 million-hour MTBF further reflects a solid dependability profile. This model does not include power loss protection (PLP), so it is best deployed in systems with stable power or UPS backup where protection of in-flight writes during an unexpected outage is managed at the system level.
1. The PCIe 4.0 x4 interface gives the drive enough host bandwidth to keep modern servers fed, reducing storage bottlenecks in virtualized databases, analytics nodes, and high-density compute platforms.
2. With sequential read performance reaching 7000 MB/s, the SSD accelerates large-block workloads such as dataset streaming, backup restores, and rapid application or VM image loading.
3. Delivering up to 1,000,000 K random read IOPS, it is well suited for latency-sensitive enterprise tasks like OLTP databases, metadata-heavy file systems, and high-concurrency cloud services.
4. Built on Samsung V-NAND 7th Gen TLC and rated at 0.3 DWPD, the drive targets read-centric enterprise deployments where capacity, efficiency, and predictable lifecycle matter more than heavy daily overwrite endurance.
5. A typical latency of 60 µs helps shorten response time at the transaction level, improving QoS consistency for real-time applications and mixed-workload server environments.
Lower capacity reference: 512 GB Higher capacity reference: 2 TB In this series, the 1 TB model sits at the sweet spot. Compared with the 512 GB version, it gives much better headroom for OS images, application growth, logs, and overprovisioning, reducing the risk of early capacity pressure. Compared with the 2 TB model, it preserves nearly the same enterprise-class sequential and random performance while delivering a more efficient cost profile and easier volume standardization. It is best suited for mid-scale deployments, such as boot and application storage for about 40–60 virtualized infrastructure nodes or a compact mixed-workload cluster.
Q: Is MZVL21T0HDLU-00B07 suitable for a write-heavy database server?
A: Not ideally. With 0.3 DWPD, 600 TBW, and no PLP, this 1 TB TLC PCIe 4.0 SSD is better suited for read-intensive or mixed workloads than sustained write-heavy database servers.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: Its rated endurance is 0.3 drive writes per day. For a 1 TB model, that equals about 300 GB of writes daily on average across the warranty period.
Q: Does it include power loss protection (PLP) and why is that critical?
A: No, it does not include PLP. This matters because PLP helps protect in-flight data and metadata during sudden outages, which is especially important for enterprise databases and transactional workloads.
Q: What RAID level is recommended for this SSD?
A: For most deployments, RAID 1 or RAID 10 is recommended to improve redundancy and read performance. RAID 5 is less ideal for heavier writes due to parity overhead and endurance impact.