Samsung MZ-ILS1T9B 1.92TB PM1633a Series SAS 12Gb/s 2.5 15mm Enterprise Data Center / Read Intensive Solid State Drive

General

Brand	Samsung
Model	PM1633a Series
Capacity	1.92TB
Usage Class	Enterprise Data Center / Read Intensive

Interface

Host Interface	SAS 12Gb/s
Total Interface Bandwidth	12 Gb/s

Physical Dimension

Form Factor	2.5 15mm

Flash & Endurance

NAND Flash	Samsung 48-layer 3D V-NAND TLC
Drive Writes Per Day	1
Total Bytes Written	3504 TBW

Performance

Sequential Read	1200 MB/s
Sequential Write	900 MB/s
Random Read IOPS	190000
Random Write IOPS	32000
Average Latency	110 μs

Reliability

Mean Time Between Failures	2.0 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	Yes

Part Number

MPN	MZILS1T9HEJH

Engineer's Note

Compared with the earlier MZILS1T9HEJH, the MZ-ILS1T9B in Samsung’s PM1633a Series upgrades to 48-layer 3D V-NAND TLC, delivering a more efficient endurance-and-density profile while sustaining 1200/900 MB/s sequential throughput and up to 190,000/32,000 IOPS over SAS 12Gb/s. For 1.92TB enterprise SAS deployments, its 1 DWPD and 3504 TBW make it a stronger fit than older-generation drives for virtualization clusters, read-heavy OLTP, and scale-out storage tiers that need predictable latency with standard SAS interoperability.

Endurance & Reliability

With an endurance rating of 3504 TBW and 1 DWPD, the MZ-ILS1T9B is built to handle writing its full capacity once per day throughout its rated service life, which is more than sufficient for typical enterprise boot, logging, caching, and mixed business workloads. In practical terms, under normal system-disk or infrastructure use, this level of endurance provides long-term peace of mind and can comfortably support many years of stable operation without endurance being a 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 indicates an extremely low unrecoverable bit error rate, supporting high data integrity expectations in business-critical environments, while the 2 million-hour MTBF further reflects a design focused on dependable continuous operation.

Technical Specs & Insights

1. The dual-port SAS interface enables highly available storage designs, making this drive a strong fit for mission-critical servers and enterprise arrays that require continuous access during controller or path failover.
2. Its strong sequential read capability accelerates large-block workloads such as backup recovery, media streaming, and analytics data scans, helping reduce wait time for bulk data access.
3. The high random read performance supports virtualization, OLTP databases, and metadata-heavy applications by serving large volumes of small I/O requests with consistent responsiveness.
4. The endurance profile is well suited for read-centric enterprise deployments, allowing predictable daily write activity over the warranty period without overprovisioning for heavier write workloads.
5. Built on Samsung 3D V-NAND TLC and paired with low typical latency, it delivers a practical balance of density, cost efficiency, and fast response time for mainstream data center applications.

Capacity Sweet

Lower capacity reference: 960GB Higher capacity reference: 3.84TB Capacity positioning analysis: In this series, the 1.92TB model sits at the sweet spot between entry capacity and higher-cost expansion. Compared with the 960GB version, it gives much better headroom for OS images, application growth, logs, and overprovisioning, reducing early capacity pressure in always-on enterprise workloads. Compared with the 3.84TB model, it typically delivers the same class of sequential and random performance while keeping acquisition cost and fleet-wide budgeting under tighter control. It is especially well suited for mid-scale virtualization clusters, database nodes, and mixed-read/write application servers.

FAQ