Lenovo 4M17A80521 ST50 Dual SD Cards Adapter KIT V2

Lenovo 4M17A80521 ST50 Dual SD Cards Adapter Kit V2

Overview

The Lenovo 4M17A80521 is the Dual SD Cards Adapter Kit V2 designed for the ThinkSystem ST50 tower server. This internal adapter provides two SD card slots, enabling the server to boot from SD media or use SD-based storage for hypervisor images and lightweight OS deployments — a practical option when you want a dedicated, separate boot device that keeps HDDs and SSDs free for workload data. The 4M17A80521 eliminates reliance on USB drives for OS boot, which reduces boot-media failure risk in production environments.

Compatibility

Designed specifically for the Lenovo ThinkSystem ST50 tower server platform. Verify against your ST50 generation (V1 vs V2) before ordering — the V2 designator in this kit corresponds to updated ST50 V2 hardware. This adapter is not interchangeable with other ThinkSystem tower or rack models (ST250, ST550, SR series) without confirming server accessory compatibility in Lenovo's ServerProven configurator. If your deployment involves edge NVR or server-based recording on ST50 hardware, this kit supports a clean OS-on-SD architecture that isolates recording storage from the boot volume.

Installation Notes

Installation is an internal server operation requiring removal of the ST50 chassis cover and seating the adapter into the designated SD card header on the system board. Confirm the target slot is unpopulated before installation. SD cards are not included — source cards rated for server-grade continuous write cycles (SLC or pSLC NAND; standard consumer SD cards are not suitable for 24/7 write workloads). Refer to the ST50 V2 Hardware Maintenance Guide for the exact connector location and any torque or retention clip requirements specific to your board revision.