1. I had set the checkbox to „Max USB Current“ before my recent posting. It is still set that way. It does not change the symptoms.
2. I have tried an externally powered USB hard disk. I have also tried another brand of USB thumb drive. Neither changes the symptoms.
3. When I access the Webadministration, and click on the Basic Settings tab, and click on one of the Browse buttons, under /dev, there is no /sdal.
Thank you for continuing to try with me. Thus far, the problem still looks to be with the buster image. Would it be of value for me to try a piCorePlayer image? If I get the problem with both piCorePlayer and m2p, and not with moOde nor volumio, that would imply a problem with LMS. If I get the problem with m2p but not piCorePlayer, that would imply a m2p problem.