Lenovo 4XB7A77460 ST50 V2 2.5 S4520 480GB 6GB NHS SSD

Lenovo 4XB7A77460 480GB 2.5" SATA III Server SSD

Overview

The Lenovo 4XB7A77460 is a 480GB 2.5-inch SATA III solid-state drive built specifically for Lenovo ThinkSystem ST50 V2 servers, delivering 6 Gb/s throughput, hardware-level AES-256 encryption, and end-to-end data protection in a hot-swap-compatible form factor. This is not a general-purpose consumer SSD — it is a validated server-class storage component sourced through Lenovo's server storage line, designed to integrate without qualification risk into ST50 V2 environments running workloads from light virtualization to edge compute and data collection.

If you are expanding storage in an ST50 V2 or provisioning a new build and need a validated, NHS (non-hot-swap) SATA SSD at 480GB, the 4XB7A77460 is the model to evaluate. For environments that require full hot-swap capability, a different drive configuration should be considered.

Key Features

• 480GB 3D TLC NAND Capacity: Provides enough headroom for OS, application stack, and working datasets on an entry server without over-provisioning. 3D TLC NAND balances cost efficiency with write endurance appropriate for server workloads — a better choice than QLC when write patterns are mixed or unpredictable.
• 6 Gb/s SATA III Interface: Saturates the ST50 V2's onboard SATA controller without bottlenecking sequential throughput. No driver changes or HBA upgrades needed — this slots in as a standard server storage device.
• 79,000 Random Read IOPS (4KB): At 4KB block size, 79K read IOPS handles concurrent database lookups, log reads, and OS paging efficiently. For a workgroup or edge server handling a dozen simultaneous users or sensors, this head room means the drive won't become the constraint.
• 30,000 Random Write IOPS (4KB): 30K write IOPS is sufficient for write-intensive ancillary tasks — think surveillance metadata indexing, event logging, or VM disk writes — while keeping the cost below NVMe-class drives that deliver more IOPS than most ST50 workloads can use.
• 256-bit AES Hardware Encryption: Encryption is offloaded to the drive controller, so no CPU cycles are consumed managing data-at-rest protection. In regulated environments — healthcare edge, government branch, financial back-office — this matters. If a drive is removed or the server is decommissioned, encrypted data is unreadable without the key. No software encryption layer required.
• End-to-End Data Protection: The drive monitors data integrity from the host controller through the NAND cells. Bit errors that develop between the controller and storage medium are caught and flagged rather than silently written as corrupted data. In a server context, silent data corruption is more dangerous than a detectable failure — end-to-end protection means you find out before it propagates.
• UBER < 1 per 10¹⁷ bits read: The uncorrectable bit error rate is effectively one error per 12.5 petabytes read — a level that makes undetected read failures statistically rare across the drive's usable life. This is standard enterprise-class UBER, significantly below consumer SSD specifications.
• S.M.A.R.T. Support: Compatible with standard disk health monitoring tools. Server management platforms can poll drive health, wear indicators, and temperature without specialized software — straightforward to integrate into existing infrastructure monitoring workflows.
• Sub-100µs Read Latency: Random read latency tops at 102 µs, sequential read latency at 36 µs. For applications sensitive to storage response time — edge analytics platforms, lightweight databases, real-time event processing — this puts the drive well below spinning disk latency with no additional tuning required.
• 2.5-Inch NHS Form Factor: The NHS (non-hot-swap) designation means drive replacement requires powering down the system. This is consistent with entry server maintenance windows and is the expected behavior for the ST50 V2's NHS bays. Size and connector are standard, so physical installation is straightforward for any integrator familiar with server component installation.

Integration & Compatibility

The 4XB7A77460 is validated for the Lenovo ThinkSystem ST50 V2. Lenovo server-class SSDs are factory-configured and tested against the ST50 V2's firmware and BIOS compatibility matrix, which eliminates the qualification uncertainty that comes with third-party drives. The S4520 model designation (Intel S4520 series) places this in Intel's value SATA SSD line for servers — a platform that has broad compatibility with enterprise OS environments including Windows Server, RHEL, Ubuntu Server, and VMware ESXi.

For ST50 V2 deployments used as network video recorders or edge compute nodes in physical security infrastructure, the combination of hardware encryption and end-to-end protection is relevant beyond basic storage: it satisfies many compliance requirements for data-at-rest on video or sensor data without layering software overhead onto the host CPU. Pair with a SATA II or SATA III cable appropriate for the ST50 V2 bay configuration — no additional controller cards are required.

Frequently Asked Questions

Q: Is the Lenovo 4XB7A77460 a hot-swap drive?

A: No. The 4XB7A77460 carries an NHS (non-hot-swap) designation, meaning the server must be powered down before the drive can be safely installed or replaced. This is consistent with the Lenovo ST50 V2's NHS bay configuration.

Q: Does the 4XB7A77460 use NVMe or SATA?

A: SATA. The drive uses a 6 Gb/s SATA III interface. It does not support NVMe. For workloads requiring NVMe throughput, a different drive model would be needed.

Q: What encryption does the 4XB7A77460 support?

A: The drive implements 256-bit AES hardware encryption at the controller level. Encryption is handled by the drive itself, so no host CPU cycles are consumed and no software encryption layer is required for data-at-rest protection.

Q: What is the random read IOPS rating for the 4XB7A77460?

A: At 4KB block size, the drive delivers up to 79,000 random read IOPS and up to 30,000 random write IOPS.

Q: What servers is the 4XB7A77460 compatible with?

A: The 4XB7A77460 is specifically validated for the Lenovo ThinkSystem ST50 V2. It is a Lenovo-sourced server SSD (Intel S4520 platform) intended for use in validated Lenovo server configurations. Compatibility with other server platforms is not verified by this specification.

Q: Does the 4XB7A77460 support S.M.A.R.T. monitoring?

A: Yes. The drive supports S.M.A.R.T., allowing standard server management platforms and monitoring tools to poll drive health, wear levels, and temperature without additional software.

Eden Phillips

The 4XB7A77460 is a purpose-validated Lenovo server SSD — and the detail that matters most in practice is the end-to-end data protection combined with an UBER of less than 1 per 10¹⁷ bits read. In an ST50 V2 deployed as an edge compute node or lightweight NVR, you are not just looking for storage throughput; you are looking for a drive that won't silently corrupt data under the mixed read/write patterns those workloads generate. This drive covers that ground at a SATA price point.

Technical Highlights:

• 79,000 / 30,000 IOPS (Read/Write at 4KB): Adequate for concurrent OS, application, and data workloads on an ST50 V2 without reaching the ceiling during normal operation — the read headroom is particularly useful for VM paging or database query patterns.
• 256-bit AES Hardware Encryption: Controller-level encryption means zero CPU tax for data-at-rest protection. For branch office, healthcare edge, or any deployment where a decommissioned server might leave the building, this eliminates the need for a software encryption layer and satisfies most data-at-rest compliance requirements out of the box.
• 102 µs Random Read Latency / 36 µs Sequential Read Latency: These are tight enough to avoid becoming a bottleneck on an entry server. The gap between random and sequential latency (102 µs vs 36 µs) is expected on TLC NAND and reflects normal behavior — not a deficiency — but it is worth understanding if your workload is highly random-write-intensive.

Deployment Considerations:

• The NHS designation is not a limitation to work around — it is the expected maintenance model for the ST50 V2's bay configuration. Plan drive replacements into a maintenance window rather than treating this as an HA storage tier.
• 3D TLC NAND carries lower write endurance than SLC or MLC alternatives. For workloads with sustained, high-volume sequential writes (continuous video recording directly to this drive without a buffer layer), monitor drive wear via S.M.A.R.T. and factor endurance ratings into your replacement cycle planning.

The 4XB7A77460 is the right specification for an ST50 V2 deployed as a secure edge server — whether that is a branch IT node, a physical security appliance, or a lightweight virtualization host — where validated compatibility, hardware encryption, and data integrity matter more than peak NVMe throughput.