Seeed Studio solders a PCIe 3.0 switch to a Raspi 5 adapter. It enables the use of two fast SSDs or the combination of SSD ...
Before proceeding, you will need a cable or adapter to connect the new SSD to your machine; your existing hard disk is already connected. It is fairly simple if you are using a desktop.
SilverStone has developed the ECM40 PCIe 4.0 x16 to 4x M.2 NVMe SSD adapter card. This adapter is engineered to expand a system by supporting four M.2 SSDs of form factors 2230, 2242, 2260 ...