M.2 M Key to SATA3.0 Expansion Board (Compatible with LattePanda Sigma)

M.2 M Key to SATA3.0 Expansion Card for LattePanda Sigma enables high‑capacity storage expansion through a compact PCIe-based adapter designed for the Sigma motherboard. The M.2 storage expansion board converts a single M.2 M‑Key slot into five SATA3.0 ports, allowing connection of multiple SATA devices such as SSDs, HDDs, SSHDs, and optical drives. Powered by a PCIe 3.0 x2 interface, this multi‑drive SATA controller provides fast data transmission and stable operation without requiring driver installation. The plug‑and‑play design allows Sigma systems to quickly expand local storage for data‑intensive applications, embedded computing, and workstation environments.

Five-Port SATA Storage Expansion

This PCIe-to-SATA expansion module integrates the JMB585 controller to convert an M.2 M‑Key interface into five independent SATA3.0 ports. The design allows a single embedded computer to connect multiple storage devices simultaneously, enabling flexible configurations such as multi‑SSD arrays or large‑capacity HDD storage pools. High‑speed PCIe 3.0 x2 uplink bandwidth supports stable multi-drive operation, making this storage expansion board suitable for edge servers, local data logging systems, and compact NAS‑style builds using LattePanda Sigma hardware.

Figure: M.2 M Key to SATA3.0 Expansion Card use JMB585 chip

Real-Time Drive Status Monitoring

Each SATA connection corresponds to a dedicated activity indicator, enabling immediate visual feedback for device connection and data activity. When a SATA storage device is connected, the status LED remains illuminated; during read or write operations, the indicator flashes to reflect active data transfer. This visual monitoring capability allows engineers and system integrators to quickly verify drive connectivity and storage behavior, which simplifies debugging and system diagnostics in multi‑drive computing environments.

Figure: M.2 M Key to SATA3.0 Expansion Card equipped with an indicator light

Enhanced Thermal Stability

An integrated aluminum alloy heat sink improves thermal dissipation for the onboard controller during sustained data transfer. Efficient heat management helps maintain consistent performance when multiple SATA drives operate simultaneously, especially in compact embedded systems where airflow may be limited. The thermal design supports long-duration workloads such as continuous data logging, media storage, and edge computing tasks that require reliable multi‑drive operation.

Figure: M.2 M Key to SATA3.0 Expansion Card equipped with an aluminum alloy heat sink

Designed for embedded computing, this multi‑port SATA adapter enables flexible storage expansion in compact systems. Typical deployments include local data servers, AI edge computing storage, industrial data logging, and multimedia workstations that require multiple drives connected to a single LattePanda Sigma platform.

Figure: Wiring Diagram of M.2 M Key to SATA3.0 Expansion Card and LattePanda Sigma