General

Brand	Samsung
Model	PM9A1
Capacity	256GB
Usage Class	Client

Interface

Host Interface	NVMe
Total Interface Bandwidth	64 Gb/s

Physical Dimension

Form Factor	M.2 2280

Flash & Endurance

NAND Flash	TLC V-NAND
Drive Writes Per Day	0.33
Total Bytes Written	150 TBW

Performance

Sequential Read	6400 MB/s
Sequential Write	2700 MB/s
Random Read IOPS	500000
Random Write IOPS	600000
Average Latency	50 μs

Reliability

Mean Time Between Failures	1.5 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	No

Part Number

MPN	MZVLB256HBHQ

Engineer's Note

Compared with the previous-generation MZVLB256HBHQ, the Samsung PM9A1 MZVL2256HCHQ-00BH1 delivers a clear generational step up with PCIe NVMe bandwidth reaching 6400/2700 MB/s and random performance up to 500K/600K IOPS, giving 256GB client and embedded platforms much faster boot, load, and scratch-disk responsiveness. Its TLC V-NAND design, 150 TB TBW, and 0.33 DWPD make it a stronger choice than the prior model for read-heavy workstation, edge appliance, and OEM system-drive deployments where higher throughput and better sustained reliability are required within the same capacity class.

Endurance & Reliability

With an endurance rating of 150 TBW and 0.33 DWPD, the MZVL2256HCHQ-00BH1 is well suited for typical OS, office, and general-purpose business workloads where daily writes are modest. In practical terms, 150 TBW equals about 41 GB of writes per day over 10 years, making it a dependable choice as a boot or system drive under normal usage patterns. For reliability, its UBER of 1.0E-15 indicates a very low unrecoverable bit error rate, supporting strong data integrity in everyday operation, while the 1.5 million-hour MTBF reflects solid long-term component reliability. This model does not include power-loss protection, so it is best deployed in environments with stable power or UPS support rather than write-critical applications that require in-flight data protection during sudden outages.

Technical Specs & Insights

1. The NVMe interface cuts protocol overhead and unlocks deeper parallelism, helping cloud, virtualization, and scale-out application servers respond faster under heavy concurrency.
2. Its strong sequential read performance accelerates large-block data movement, reducing wait time for analytics scans, backup restores, and AI model or dataset loading.
3. The high random read capability is well suited to metadata-heavy databases, virtual desktop environments, and read-intensive web platforms that depend on sustained small-block responsiveness at scale.
4. This endurance profile fits read-dominant enterprise deployments such as boot volumes, content repositories, and general-purpose server storage where capacity efficiency matters more than constant heavy rewriting.
5. TLC V-NAND provides an effective balance of density, cost, and reliability, while the microsecond-class typical latency helps keep transaction paths, cache lookups, and latency-sensitive services consistently snappy.

Capacity Sweet

Lower capacity reference: 128GB Higher capacity reference: 512GB Capacity positioning analysis: Within this enterprise SSD family, 256GB is the sweet-spot capacity. Compared with 128GB, it provides noticeably better space headroom for OS images, logs, patches, and application growth, reducing the risk of early capacity pressure while keeping the same class of sequential throughput and random IOPS. Compared with 512GB, it reaches a better balance between acquisition cost and usable capacity, avoiding overprovisioning for lighter workloads. It is especially well suited for small to mid-sized virtualization clusters, such as hosting boot volumes for around 25 to 40 business application VMs.

FAQ