Lenovo 4M17A80603 ST250 2.5 Sata/sas 8-BAY BP KIT (X40)

Lenovo 4M17A80603 ST250 2.5" 8-Bay SAS/SATA Backplane Kit

Overview

The Lenovo 4M17A80603 is a factory-replacement backplane kit that adds or restores an 8-bay 2.5" drive cage to the ThinkSystem ST250 tower server. If you're expanding storage capacity in an ST250 or replacing a damaged backplane assembly, this is the part that makes it happen — without it, the server cannot address additional 2.5" SAS or SATA drives in the target bay position. Weighing 10 lb, the kit ships as a complete assembly (X40 quantity designation) ready to install into the supported chassis. Dual-protocol support for both SAS and SATA means you're not locked into one drive type: mix enterprise SAS spinners for throughput with SATA SSDs for capacity tiers on the same backplane.

Compatibility

Designed specifically for the Lenovo ThinkSystem ST250 tower server platform. The 2.5" form factor and 8-bay configuration are chassis-specific — do not attempt to fit this backplane into ST50, ST550, or SR-series rack units; bay geometry and connector routing differ across platforms. Verify your ST250's current drive bay configuration and chassis revision against Lenovo's parts compatibility matrix before ordering. SAS and SATA interface support aligns with the 2.5" enterprise drive options Lenovo qualifies for the ST250, including both 10K SAS and SATA SSD variants. If your deployment uses a NAS or storage expansion strategy alongside edge servers, confirm that the host HBA or onboard controller in your ST250 supports the drive protocol you intend to populate.

Installation Notes

Installation requires access to the ST250 chassis interior with the system powered down and unplugged. The backplane slots into the drive cage bracket and connects to the server's SAS/SATA controller via internal cable runs — cable routing and connector assignments should be confirmed against the ST250 Hardware Maintenance Guide for your specific chassis revision. Ensure the system's power supply capacity accounts for the additional drive load before fully populating all 8 bays. No external tools beyond standard server servicing equipment are specified in the available evidence.