Here's a handy thing: a mini USB hub for the m4 mac mini. It mounts to the two front USB-C ports and provides two USB-A ports rated at 10Gbps; two USB-C ports good for 10Gbps and Sd/micro SD card slots. I attached two HDDs to the USB-A ports and two SSDs to the USB-C ports. All volumes mounted successfully, System Information showing the SSDs able to run at 10Gbps anfd the two HDDs at 5Gbps, which is no different to how the behave when connected directly to the mac. the device is by RayCue and is called the MiniPack hub. It's very compact, smaller than the 20W charger that comes with an iPad these days.
