Wow, looks like you have taken my bet in the thread7.1 which is current with everything we know of today (AHCI, NVMe, USB, UEFI) June 2023.
So after doing a ton of reading this morning I think I have it figured out. The B key is for SATA and NVMe using 2 PCIe lanes and the M key is for NVMe using 4 PCIe lanes. Both of these are M.2 slots but not compatible since it appears that the M key has to use all 4 lanes and cannot be restricted down to 2 lanes.Are there any decent (working) NVME to SATA converters? In the "old" days, I had bought a SATA to PATA converter, which worked with SpinRite. (And actually worked faster than native SATA support on some of my boxes. AND allowed me to see SMART data on the SATAs.) Perhaps this would be a workaround until SR works with NVME? (In my case, I have NMVE M.2, which seems different from NVME SATA?)
In short, no. What you can get is a NVMe to PCIe card, like this https://www.overclockers.co.uk/akasa-m.2-ssd-to-pcie-adapter-card-cc-008-ak.html.Are there any decent (working) NVME to SATA converters?
It's unlikely you have a lot to choose from. A quick Google found this https://chrome.google.com/webstore/detail/newsgroup-usenet-client/ennibkoenmldikkoeopfijoknilhkiabWhat's a good newsreader for a Chromebook?