Lenovo 4XB7A76941 ST50 3.5 S4520 480GB RI SATA NHS

Lenovo 4XB7A76941 480GB 3.5" SATA Read-Intensive SSD for ThinkSystem ST50

Overview

The Lenovo 4XB7A76941 is a 480GB 3.5-inch SATA solid-state drive purpose-built for the ThinkSystem ST50 tower server. Rated as a Read-Intensive (RI) workload drive and built on 3D TLC NAND, it targets deployments where the I/O profile skews heavily toward reads — VMS database indexes, NVR metadata stores, or local application caching on an entry-level server. If your ST50 handles a mixed-read workload like a video management server running query-heavy analytics, this is the correct drive class to spec. For write-heavy transactional workloads, a Mixed-Use or Write-Intensive variant in the Lenovo server storage line would be a better fit.

Key Features

• 480GB Capacity on 3D TLC NAND: 3D TLC stacks cells vertically to pack 480GB into the 3.5-inch chassis without compromising the drive's endurance envelope for read-intensive duty cycles. For a server-side NVR or VMS host, 480GB is enough headroom to run the OS, database, and a local application stack simultaneously without thrashing a smaller system drive.
• 79,000 Random Read IOPS (4KB): At 79K 4KB random read IOPS, the 4XB7A76941 handles the bursty lookup patterns common in VMS event databases and SATA NVR metadata tiers — where the storage subsystem needs to respond quickly to concurrent query threads without queuing delays.
• 30,000 Random Write IOPS (4KB): Write performance is intentionally constrained relative to read — this is the defining characteristic of an RI-class drive. At 30K write IOPS it handles sequential log writes and periodic index updates cleanly, but sustained write-heavy workloads will degrade endurance faster than intended. Size your workload accordingly.
• 36 µs Read and Write Latency: Both read and write latency are specified at 36 microseconds, which keeps response times consistent for the application layer. For a server-hosted VMS like Milestone or Genetec, consistent low latency on the application drive means the software tier doesn't wait on storage during peak camera event bursts.
• Hardware Encryption: The drive includes hardware-based encryption, allowing the ST50 to enforce data-at-rest protection without offloading encryption cycles to the CPU. Relevant for deployments in regulated environments or physically accessible server closets where drive removal is a plausible threat vector.
• 3W Maximum Power Draw: At a 3W ceiling, this drive contributes minimal thermal load to the ST50's chassis. Entry-level tower servers often have constrained cooling budgets; a 3W SSD versus a spinning HDD keeps temperatures predictable and fan profiles quiet in office-adjacent environments.
• SATA Interface: SATA connectivity means the ST50's native controller handles this drive without any additional HBA or driver work. Straightforward drop-in provisioning for the supported slot — no firmware gymnastics required.
• S.M.A.R.T. Support: S.M.A.R.T. telemetry exposes drive health metrics to the server's management stack, enabling proactive replacement before a failure event. Integrate with Lenovo XClarity or a third-party monitoring agent to catch early wear indicators.
• Operating Range 0–70°C: The 0–70°C operating temperature window and 5–95% relative humidity tolerance cover standard server room and office closet conditions. This is not a hardened industrial drive — it assumes a climate-controlled environment, which is the correct assumption for an ST50 deployment.

Integration and Compatibility

The 4XB7A76941 is designed and validated for the ThinkSystem ST50 server platform. SATA interface compatibility is straightforward, but drive qualification lists on Lenovo server platforms are strict — always verify the ST50's Hardware Maintenance Manual or Lenovo's online configurator to confirm this SKU is listed for your specific ST50 generation before ordering. The NHS (Non-Hot-Swap) designation means the server must be powered down before drive installation or replacement; plan maintenance windows accordingly if deploying in a production VMS environment. For environments requiring continuous uptime, consider a hot-swap-capable platform in the server category instead.

For integrators building out a complete surveillance server stack, pairing this drive with a structured PoE switch infrastructure and a validated NVR platform ensures the storage tier is appropriately matched to camera channel count and retention requirements. Consult a surveillance storage sizing guide to confirm 480GB aligns with your database and OS footprint before committing to a single-drive configuration.

Frequently Asked Questions

Q: Is the Lenovo 4XB7A76941 a hot-swap drive?

A: No. The NHS designation stands for Non-Hot-Swap. The ThinkSystem ST50 must be powered down before installing or removing this drive. Plan maintenance windows accordingly for any production server deployment.

Q: What workload class is this drive rated for?

A: The 4XB7A76941 is a Read-Intensive (RI) class drive. It delivers 79,000 random read IOPS and 30,000 random write IOPS at 4KB block size. It is optimized for workloads where reads significantly outpace writes — such as VMS application databases, OS volumes, or caching tiers. Sustained write-heavy workloads will reduce drive endurance below the RI-class rating.

Q: Does the 4XB7A76941 include hardware encryption?

A: Yes. Hardware-based encryption is included, enabling data-at-rest protection without a CPU performance penalty. This is relevant for regulated environments or physically accessible server deployments.

Q: What is the form factor and interface for this drive?

A: The drive uses a 3.5-inch form factor with a SATA interface. It is designed for the ThinkSystem ST50 server and connects to the native SATA controller — no additional HBA required.

Q: What are the environmental operating limits?

A: The drive operates between 0°C and 70°C with a relative humidity range of 5–95%. This is standard for climate-controlled server room and office closet installations.

Karl Wilson

The 4XB7A76941 is a straightforward spec if you're provisioning storage for a ThinkSystem ST50 running a VMS application stack — the 79,000 read IOPS ceiling is the number that matters most here, because VMS database query patterns are almost entirely read-dominated once the event index is built. The RI classification is honest about what this drive is built for, and that alignment with actual workload is what keeps endurance on track over a multi-year deployment.

Technical Highlights:

• 79K Read / 30K Write IOPS (4KB): The 2.6:1 read-to-write IOPS ratio reflects the RI design intent exactly. For a Milestone or Genetec application server querying thousands of motion events per hour, that read headroom keeps the software tier responsive without the cost premium of a mixed-use or write-intensive drive.
• 36 µs Dual Latency: Symmetric 36 µs read and write latency means the application layer sees consistent response times regardless of I/O direction. No hidden write-latency spikes to tune around.
• 3W Max Power: At 3W the drive is well within the ST50's thermal envelope. For an entry-level tower deployed in an office closet without dedicated server cooling, that matters — it keeps fan ramp events from disrupting a quiet environment.

Deployment Considerations:

• The NHS (Non-Hot-Swap) designation is the critical operational constraint: any drive swap requires a planned power-down. If this server runs a live NVR feed with no failover, build a maintenance window into your SLA before deployment rather than discovering the limitation during an emergency replacement.
• The 0–70°C operating range covers standard office and server room environments but provides no margin for uncontrolled spaces. Do not deploy this in an untreated utility closet or outdoor-adjacent enclosure without verifying ambient temperature stays inside that window year-round.

This drive is the right call for a ThinkSystem ST50 provisioned as a single-node VMS application server in a small-to-mid commercial site — say, a 16–32 camera deployment running Milestone Essentials or Genetec Security Center on a constrained hardware budget where the OS and application database share a single SATA volume.