Cytron Technologies is quite excited about the release of a stable USB boot firmware for Raspberry Pi 4 Model B, 400, and also CM4. And with the Compute Module 4 (CM4), the PCIe Gen2 bus is exposed on some carrier boards, such as Piunora or Mini Base (A). Additionally, Raspberry Pi is officially releasing NVMe booting. This is native NVMe SSD booting over the PCIe bus — it does not go through any USB-NVMe adapter. This NVMe SSD is in M.2 2242 (B+M Key) form factor. Cytron calls it MakerDisk! A drive from makers to makers :) It is an M.2 2242, B+M-Key, NVMe Solid State Drive (SSD) with a capacity of 128 GB. And it comes preloaded with Raspberry Pi OS.