I had an Ubuntu server using 18.04 LTS and this had one external hard-drive (not an SSD) connected to it via USB, and it would always spin down after some time as expected. I never configured or enabled anything to achieve that. The default behavior was just fine.
Now I have connected the same external disk to my new Ubuntu 22.04 LTS server and it does not spin down, even when idle for hours. It stays constantly spinning.
Do I need to configure something to make it spin down after some idle time? Or is something touching the disk too often? How can I find out what touches it?
