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	16 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 Samsung PM9A3 MZQL21T9HCJR-00W07 upgrades to a PCIe Gen4 x4, NVMe 1.4 architecture with Samsung V6 128-layer TLC, delivering up to 6,800 MB/s sequential read, 4,000 MB/s write, and 1,000,000 random-read IOPS for a clear step up in bandwidth and transaction performance. At 1.92 TB with 1 DWPD and 3,504 TBW, it is a strong fit for read-intensive virtualization, scale-out storage, and cloud application tiers that need higher throughput and modern interface efficiency than the earlier model without moving to a higher-endurance class.

Endurance & Reliability

With an endurance rating of 3,504 TBW and 1 DWPD, the MZQL21T9HCJR-00W07 is designed to support writing its full capacity once per day across its rated service life, which is more than sufficient for typical enterprise boot, OS, and general server workloads. In practical terms, for common system-disk and mixed read/write applications, this level of endurance provides long-term, worry-free operation with substantial headroom for normal daily writes. For enterprise reliability, the drive includes power loss protection (PLP), which helps preserve in-flight data and protects metadata integrity if power is interrupted unexpectedly. Its UBER of 1.0E-17, together with a 2 million hour MTBF, reflects a very low probability of unrecoverable bit errors and supports dependable operation in business-critical environments.

Technical Specs & Insights

1. The PCIe Gen4 x4 interface with NVMe 1.4 provides enough host bandwidth and protocol efficiency to keep modern CPUs and virtualized workloads fed without the storage stack becoming the bottleneck.
2. Its class-leading sequential read performance shortens dataset staging, backup restore, and large-model loading times for analytics and AI infrastructure.
3. The very high random read capability supports dense VM farms, metadata-heavy distributed storage, and latency-sensitive OLTP workloads with consistently fast access under concurrency.
4. Built on Samsung’s mature high-layer TLC V-NAND, the drive delivers a strong balance of capacity, cost efficiency, and enterprise-grade consistency for mainstream data center deployment.
5. The 1 DWPD endurance rating and low typical latency make it well suited for read-centric cloud, boot, caching, and scale-out storage tiers that need predictable lifespan and responsive service levels.

Capacity Sweet

Lower capacity: 960 GB Higher capacity: 3.84 TB At 1.92 TB, this drive sits in the sweet spot of the series. Compared with the 960 GB model, it gives much better headroom for OS images, application growth, logs, and overprovisioning, reducing early capacity pressure in production. Compared with the 3.84 TB option, it typically delivers the best balance of acquisition cost, usable capacity, and enterprise-grade performance consistency, since sequential throughput and random IOPS are broadly similar across nearby capacities. It is well suited for a mid-scale virtualization cluster, such as hosting boot and general-purpose data for about 40-60 virtual machines.

FAQ