Samsung MZQL21T9HCJR 1.92TB PM9A3 NVMe PCIe Gen4 x4 2.5 inch Enterprise Solid State Drive

General

Brand	Samsung
Model	PM9A3
Capacity	1.92TB
Usage Class	Enterprise

Interface

Host Interface	NVMe PCIe Gen4 x4
Total Interface Bandwidth	64 Gb/s

Physical Dimension

Form Factor	2.5

Flash & Endurance

NAND Flash	Samsung V-NAND 6th Gen TLC
Drive Writes Per Day	1
Total Bytes Written	3504 TBW

Performance

Sequential Read	6800 MB/s
Sequential Write	2700 MB/s
Random Read IOPS	850000
Random Write IOPS	160000
Average Latency	85 μs

Reliability

Mean Time Between Failures	2 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	Yes

Part Number

MPN	MZQLB1T9HAJR

Engineer's Note

The Samsung PM9A3 1.92TB (MZQL21T9HCJR) delivers a clear generational step up from MZQLB1T9HAJR by moving to NVMe PCIe Gen4 x4 and Samsung 6th Gen V-NAND TLC, enabling up to 6,800 MB/s sequential read and 850,000 random read IOPS for substantially higher host-side throughput and faster latency-sensitive data access. For mainstream server and scale-out cloud deployments, it combines that performance uplift with enterprise endurance at 1 DWPD and 3,504 TBW, making it a stronger fit than the previous generation for mixed-read workloads such as virtualization, distributed storage, and high-density web infrastructure.

Endurance & Reliability

With an endurance rating of 3,504 TBW and 1 DWPD, the MZQL21T9HCJR is designed to handle writing its full capacity once per day throughout its rated service life, which is more than sufficient for typical enterprise boot, read-intensive, and mixed mainstream workloads. In practical terms, for common system-disk or server OS deployments, this level of endurance provides long-term operational headroom and can comfortably support many years of normal use without endurance concern. For enterprise reliability, the drive includes Power Loss Protection (PLP), which helps preserve in-flight data and protects metadata integrity during unexpected power interruptions, reducing the risk of corruption and unclean shutdown issues. Its UBER of 1.0E-17 and 2 million-hour MTBF indicate enterprise-class data integrity and dependability, giving procurement teams confidence in stable operation for critical business environments.

Technical Specs & Insights

1. The NVMe over PCIe Gen4 x4 architecture provides a high-bandwidth, low-overhead data path that keeps modern database, virtualization, and analytics servers from being bottlenecked by storage.
2. Its strong sequential read performance accelerates large-block workloads such as backup restores, media processing, and AI dataset ingestion, reducing wait time for bulk data movement.
3. The high random read capability is especially valuable for latency-sensitive applications like OLTP databases, VDI, and metadata-heavy cloud services, where many small requests must be served concurrently.
4. With a moderate write-endurance profile backed by Samsung’s 6th Gen V-NAND TLC, this drive is well suited for read-centric enterprise deployments that still require dependable long-term service life and cost-efficient capacity.
5. The low typical latency helps applications respond more consistently under load, improving transaction speed and user experience in real-time enterprise environments.

Capacity Sweet

Lower capacity reference: 960GB Higher capacity reference: 3.84TB In this series, the 1.92TB model sits at the sweet spot for mainstream enterprise deployment. Compared with the 960GB version, it gives much better headroom for OS images, application growth, logs, and overprovisioning, reducing the risk of early capacity pressure. Compared with the 3.84TB option, it delivers a more attractive cost-to-performance balance while keeping similar enterprise-class sequential throughput and random IOPS behavior. It is especially well suited for mid-scale virtualization clusters, such as hosting boot and application volumes for about 40 to 60 general-purpose virtual machines.

FAQ