HDDs keep spinning up

hi,

i know, its best to not let the hdd spin down but right now i have to use it because its just too loud until i get my hdd decouple stuff.

but since today i cant spin down the hdds, almost immediately they will spin up again, and every few seconds something is writing to it.(a few bytes)

i killed every vm and dockers, deleted unused plugins, tried to reboot, disconnected all devices, but they dont stop. something is waking them up.

whats the best way to find out whats causing it? i already tried open files but that didnt help.

greetings