On Mon, Dec 23, 2024 at 10:03:46AM +0000, Patrick Welche wrote: > Slightly more clue: umass0/msdos was an SD card in a USB SD card > reader. The SD card sd0 kept going offline and returning which > presumably resulted in the above. dd'ing its constents locally > and using the file as a vnd worked. > > A working 10T real drive when plugged into a USB external enclosure > also keeps going on and offline. Works fine when connected directly > via SATA.
Both of these jibe with my experience, unfortunately; the msdos fs code is kinda janky and unreliable at best, and umass and the rest of the USB subsystem (in particular: ehci) is not much better. It's been that way for decades.
