Okay - you could be right by that - I’m not sure about this. I can tell you that with an sandisc 64 gb it works just fine. And are you sure that the node doesn’t run on your sd card? Is there a stable and suitable connection to your ssd? Or you’re making a mistake while flashing. If not - I don’t now. Again - maybe it is just the best to contact someone in the Umbrel forum or on Blocktrainer.de (it is in German but one of the best sources about bitcoin). Good luck 🍀