WSAL19091 – PCIe TO M.2 (A)/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare PCIe TO M.2 adapter (WSAL19091) allows connecting an NVMe SSD to a Raspberry Pi Compute Module 4 via a PCI-E socket. It supports various M.2 sizes and features an onboard operating indicator.

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WSAL19091 – PCIe TO M.2 Adapter, Supports Raspberry Pi Compute Module 4

Technical overview

Adapter for NVMe protocol M.2 SSDs, faster reading/writing
Supports base boards with PCI-E ×1/×4/×8/×16 sockets
Compatible with different sizes of M.2 SSDs
Installation: insert the SSD into the adapter and secure it with screws
Before first use, format the SSD on a PC – do not use quick format mode
Check detection: `sudo fdisk -l`
Check storage: `df -h`
Mounting: create a directory and run `sudo mount /dev/nvme0n1p1 /home/pi/toshiba`
Read/write test using `dd` commands
For more precise testing, the SSD can also be tested directly on a PC

Commands and examples – verify before use:

sudo fdisk -l
df -h
sudo mkdir /home/pi/toshiba
sudo mount /dev/nvme0n1p1 /home/pi/toshiba
cd /home/pi/toshiba
sudo sh -c "sync && echo 3 > /proc/sys/vm/drop_caches"
sudo dd if=/dev/zero of=./test_write count=2000 bs=1024k
sudo dd if=./test_write of=/dev/null count=2000 bs=1024k

Notes and version constraints

The exact device name (e.g., nvme0n1p1) may vary by system; verify with `lsblk` or `fdisk -l` before mounting
Quick format is explicitly discouraged; use full format instead
Test results depend on the specific SSD model and Pi system
Shut down the PC before connecting the SSD, then reboot
Turn off the CM4 before inserting the adapter
Version-sensitive steps and exact commands should be verified on the target system before execution

Source and revision record

PCIe TO M.2 (A) - Waveshare Wiki
Source revision: 67445
Captured: 2026-09-01T03:56:48+00:00
SHA-256: f86a65fccc82f0845a265062c4b74033fb8f7d80312dd32320bf81f94de5e80e