M.2 SSD on Pi4?

Sorry, if it has been asked before.

Can I use an M.2 SSD USB adapter and matching M.2 SSD on a Ras Pi 4.

https://www.amazon.co.uk/Geekworm-Raspberry-Storage-Expansion-Jumper/dp/B088LQWDBD

I appreciate it will not run at USB 3 speeds, but will it work with 5.28

Yeah. They work with RISC OS. Just shows up as a hard drive. As you say, though, nothing like USB 3 speeds.

Very unhelpfully M2 comes in two flavours, B key is basically a SATA interface, and is the type USB adaptors will support, unfortunately there isn’t any performance advantage over using a mSATA drive and USB to mSATA interface, but the M2 drives and adaptors are falling in price some are less than mSATA.

The M key variant is the much faster PCIe x4 interface, but unsuitable for USB adaptors, the only option for using one of these at the moment on a Pi (running Linux) is a Compute module 4 with a carrier board which supports a PCIe x4 interface. You can get B+M devices which work with either, but probably by the time it supported by RISC OS it will be cheaper to by another M keyed drive than a B+M now.

Thank You.

unfortunately there isn’t any performance advantage over using a mSATA drive.

Thanks for that, as well. I will stick with my existing mSATA for the time being.

The M key variant is the much faster PCIe x4 interface, but unsuitable for USB adaptors

You can get USB adapters that take an NVMe M.2 stick. They present as a regular USB storage device so I don’t see a reason why they won’t work with RISC OS.

I use the X872 NVMe shield from the same manufacturer with a 250GB Samsung 970EVOPLUS NVMe M.2 SSD as my boot drive on a Pi 4 running RISC OS 5.29 at 2.1GHz. It works well but as RISCOSBits says nothing like USB 3 speeds. We live in hope that one day that will change for RISC OS.