General

Brand	Samsung
Model	PM9A3
Capacity	1.92 TB
Usage Class	Enterprise / Data Center Read Intensive

Interface

Host Interface	PCIe Gen4 x4, NVMe 1.4
Total Interface Bandwidth	64 Gb/s

Physical Dimension

Form Factor	2.5

Flash & Endurance

NAND Flash	Samsung V6 (128-layer) TLC
Drive Writes Per Day	1
Total Bytes Written	3504 TBW

Performance

Sequential Read	6800 MB/s
Sequential Write	4000 MB/s
Random Read IOPS	1000000
Random Write IOPS	180000
Average Latency	80 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-00007

Engineer's Note

Compared with the previous-generation MZQLB1T9HAJR-00007, the MZQL21T9HCJR-00A07 PM9A3 advances to PCIe Gen4 x4 and Samsung 128-layer V6 TLC, delivering up to 6,800/4,000 MB/s and 1,000,000/180,000 IOPS for clearly higher throughput and faster response in read-intensive and mixed enterprise workloads. Its standout value is combining 1.92 TB density with 1 DWPD and 3,504 TBW, making it a strong fit for virtualization clusters, scale-out databases, and high-performance boot or caching tiers that need Gen4 speed without moving to a higher-endurance cost tier.

Endurance & Reliability

With an endurance rating of 3,504 TBW and 1 DWPD, the MZQL21T9HCJR-00A07 is designed to handle writing its full capacity once per day throughout its rated service life, which is more than sufficient for typical server, boot, caching, and general enterprise application workloads. In practical terms, under normal system-disk or mixed-use deployment, this level of endurance supports long-term, worry-free operation and provides ample write margin for many years of sustained use. 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 unplanned recovery events. Its UBER of 1.0E-17, together with a 2 million-hour MTBF, indicates very strong data integrity and operational reliability, giving procurement teams confidence in stable performance for business-critical environments.

Technical Specs & Insights

1. The PCIe Gen4 x4 interface with NVMe 1.4 removes host-side storage bottlenecks, enabling faster queue handling and better parallelism for virtualization clusters, database servers, and GPU-fed workloads.
2. With sequential read performance of 6800 MB/s, this drive shortens large dataset ingestion, backup restore, and VM image loading times in enterprise environments.
3. Delivering 1,000,000 K random read IOPS, it can sustain extremely high transaction concurrency, helping latency-sensitive applications like OLTP, metadata services, and large-scale VDI stay responsive under heavy load.
4. Rated at 1 DWPD, it is well suited for mixed-read enterprise deployments that need predictable endurance for daily rewrites without overpaying for ultra-write-intensive media.
5. Built on Samsung V6 (128-layer) TLC NAND and tuned for 80 µs typical latency, it combines strong flash density with consistently fast response times for business-critical applications that depend on stable QoS.

Capacity Sweet

Lower capacity reference: 960 GB Higher capacity reference: 3.84 TB In this enterprise SSD family, 1.92 TB is the sweet-spot capacity. Compared with 960 GB, it gives much better headroom for OS images, hot datasets, logs, and growth, reducing early capacity pressure and replacement frequency. Compared with 3.84 TB, it usually delivers the best balance of acquisition cost, usable performance, and fleet-level standardization, without overcommitting budget to space that may sit idle. This makes 1.92 TB especially well suited for mid-scale virtualization clusters, such as shared boot and application storage for roughly 40 to 60 business workloads.

FAQ