Samsung MZILS960HEHP0D3 960 GB PM1633a SAS 12.0 Gbps 2.5" Read Intensive Solid State Drive

General

Brand	Samsung
Model	PM1633a
Capacity	960 GB
Usage Class	Read Intensive

Interface

Host Interface	SAS 12.0 Gbps
Total Interface Bandwidth	12 Gb/s

Physical Dimension

Form Factor	2.5"

Flash & Endurance

NAND Flash	Samsung V-NAND 48-layer 3D TLC
Drive Writes Per Day	1
Total Bytes Written	1752 TBW

Performance

Sequential Read	1300 MB/s
Sequential Write	1100 MB/s
Random Read IOPS	200000
Random Write IOPS	32000
Average Latency	100 μs

Reliability

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

Part Number

MPN	MZILS960HEHP0D4

Engineer's Note

Compared with the earlier MZILS960HEHP0D4, the Samsung PM1633a (MZILS960HEHP0D3) offers a more advanced 48-layer V-NAND design that delivers a stronger balance of 1,300/1,100 MB/s sequential performance and 1 DWPD endurance in the same 960 GB SAS 12 Gbps class. Its 1,752 TBW rating and 200K/32K random IOPS make it a more dependable choice for read-intensive enterprise virtualization and database workloads where consistent latency and predictable lifecycle matter more than raw write-heavy tuning.

Endurance & Reliability

With an endurance rating of 1,752 TBW and 1 DWPD, the MZILS960HEHP0D3 is designed to handle writing its full 960GB capacity once per day throughout its warranty period, which is more than sufficient for typical OS, application, boot, and general server workloads. In practical terms, for common read-heavy or mixed enterprise usage, this level of endurance provides strong long-term write headroom and can support many years of stable operation without endurance concerns. For enterprise reliability, the drive includes power-loss protection (PLP), which helps preserve in-flight data and protects metadata integrity if power is suddenly interrupted, reducing the risk of corruption during unexpected outages. Its UBER specification 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 reinforces confidence in dependable continuous operation.

Technical Specs & Insights

1. The dual-port SAS interface provides enterprise-grade path redundancy and stable bandwidth, making the drive well suited for mission-critical servers and storage arrays that require high availability.
2. Its strong sequential read performance helps accelerate large-block workloads such as database backup, media streaming, and faster data restore operations.
3. The high random read capability enables rapid access to small data blocks, improving responsiveness for virtualization, OLTP databases, and heavily indexed applications.
4. With an endurance profile designed for one full drive rewrite per day, it offers a balanced fit for mixed-use enterprise workloads that need predictable lifespan without overpaying for write-heavy media.
5. Samsung V-NAND 3D TLC combined with low typical latency delivers a solid mix of capacity efficiency, consistent QoS, and faster transaction handling in latency-sensitive business systems.

Capacity Sweet

Lower capacity reference: 480 GB Higher capacity reference: 1.92 TB Capacity positioning analysis: The 960 GB model sits in the sweet spot of this enterprise SSD family. Compared with the 480 GB version, it gives much better headroom for OS images, application binaries, logs, and steady data growth, reducing the risk of early capacity pressure. Compared with the 1.92 TB option, it typically delivers a more attractive cost-to-performance balance while keeping the same class of sequential throughput and random IOPS. It is well suited for mid-sized virtualization clusters, such as hosting boot and application volumes for about 40–60 business workloads.

FAQ