Lenovo 4XF7A81457 ST250 Series 4X3.5 HS Sas/sata BP KIT

Lenovo 4XF7A81457 ST250 Series 4x3.5" Hot-Swap SAS/SATA Backplane Kit

Overview

The Lenovo 4XF7A81457 is a hot-swap backplane expansion kit designed to add four 3.5-inch drive bays with SAS and SATA connectivity to the ThinkSystem ST250 tower server. If you're building out a local storage pool — whether for a small NVR deployment, an on-premises file server, or a surveillance edge node — this kit converts the ST250 from a fixed-drive configuration to a hot-swap capable chassis, letting you swap drives under power without taking the system offline. That matters in continuous-recording environments where any downtime means lost footage.

Compatibility

This backplane kit is designed specifically for the Lenovo ThinkSystem ST250 tower server series. It supports both SAS and SATA drive interfaces, giving you flexibility to install enterprise SAS drives for write-intensive workloads or cost-effective SATA drives for high-capacity storage. If you're pairing this with a network video recorder build on the ST250 platform, SATA nearline drives in the 4–18TB range are the typical choice for 24/7 surveillance recording duty cycles. Confirm your ST250 model's storage controller supports the drive interface you intend to use — SAS drives require a SAS HBA or RAID controller; SATA-only controllers will not address SAS drives. For PoE switch and storage planning in multi-camera deployments, review a storage retention planning guide before sizing drives.

Installation Notes

At 5.10 lb and 16.40 x 13.40 x 7.00 inches, this is a full-chassis-width backplane assembly — installation requires partial disassembly of the ST250 chassis. Verify the ST250 is powered down and grounded before installing. The kit slots into the factory drive bay position; no additional mounting hardware beyond what ships with the ST250 chassis should be required, though confirm with the ST250 service guide for torque specs on cage retention screws. Drive population after installation follows standard hot-swap procedures — drives can be seated with the system running once the backplane is commissioned.