Samsung MZ1L21T9HCLS 1.92 TB PM9A3 PCIe Gen4 x4 U.2 (2.5") Read Intensive Solid State Drive

General

Brand	Samsung
Model	PM9A3
Capacity	1.92 TB
Usage Class	Read Intensive

Interface

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

Physical Dimension

Form Factor	U.2 (2.5")

Flash & Endurance

NAND Flash	Samsung V-NAND 6th-Gen 128-layer 3D TLC
Drive Writes Per Day	1
Total Bytes Written	3504 TBW

Performance

Sequential Read	6800 MB/s
Sequential Write	2400 MB/s
Random Read IOPS	850000
Random Write IOPS	130000
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	MZ-1LB3T80

Engineer's Note

The Samsung PM9A3 1.92TB (MZ1L21T9HCLS) is a strong Gen4 upgrade over the earlier MZ-1LB3T80 generation, combining Samsung 6th-Gen 128-layer V-NAND with PCIe Gen4 x4 to deliver up to 6,800 MB/s sequential read and 850,000 random read IOPS for markedly faster server-side data access. With 1 DWPD endurance and 3,504 TBW in a 1.92TB class, it offers a well-balanced profile for read-centric virtualization, scale-out cloud storage, and high-throughput boot or cache tiers where higher interface bandwidth and better flash efficiency than the prior generation matter most.

Endurance & Reliability

With an endurance rating of 3,504 TBW and 1 DWPD, the MZ1L21T9HCLS is designed to support writing its full capacity once per day across the warranty period, which is more than sufficient for typical server boot, OS, logging, and mainstream read-intensive enterprise workloads. In practical terms, under normal system-disk or infrastructure use, this level of endurance provides long-term peace of mind and can comfortably sustain many years of stable operation without endurance becoming a concern. For enterprise reliability, the drive includes Power Loss Protection (PLP), which helps protect in-flight data and mapping tables during an unexpected power interruption, reducing the risk of corruption and improving service continuity. Its enterprise-class UBER of 1.0E-17, together with a 2 million hour MTBF, indicates a very low probability of uncorrectable bit errors and a high expected reliability level for business-critical deployments.

Technical Specs & Insights

1. The PCIe Gen4 x4 interface, paired with top-tier sequential bandwidth, enables ultra-fast dataset streaming and sharply reduces boot, restore, and large-volume analytics load times in modern enterprise servers.
2. Its strong random read capability sustains high transaction concurrency, making it well suited for virtualization clusters, metadata-heavy databases, and large-scale online query environments.
3. A 1 DWPD endurance profile provides predictable write sustainability for mixed enterprise workloads, helping operators balance service life, performance consistency, and storage TCO.
4. Samsung 6th-Gen 128-layer 3D TLC V-NAND delivers a mature blend of density, power efficiency, and reliability, supporting cost-effective capacity expansion without sacrificing enterprise-grade behavior.
5. The low typical latency helps accelerate response-sensitive applications such as real-time analytics, search indexing, and cloud services where tail-latency control directly impacts user experience and SLA stability.

Capacity Sweet

Lower capacity reference: 960 GB Higher capacity reference: 3.84 TB At 1.92 TB, the MZ1L21T9HCLS sits at the sweet spot of the series. Compared with the 960 GB model, it gives much better headroom for OS, application, log, and growth allocation, reducing early capacity pressure in mixed enterprise workloads. Compared with the 3.84 TB version, it usually delivers the best balance between acquisition cost, usable capacity, and the series’ broadly similar enterprise read/write and IOPS profile. It is especially well suited for mid-scale virtualization clusters, such as shared boot and application storage for about 40 to 60 virtual machines.

FAQ