When calling update-grub, it scans all devices for operating systems to put into the GRUB config. It even mounts all block devices to do the scan. I'd like to avoid this and let it scan only a number of configured directories, in my case only /boot. Scanning all devices is annoying because
* all disks that are normally idle and that have spun down (e.g. my backup drives) have to spin up. This wears off my disks unnecessarily and also causes long delays. * update-grub finds a number of operating systems that I don't want in the GRUB config, e.g. on logical volumes for virtual machines, backup images of old machines, etc. I haven't found anything on this topic in the documentation. Steve
