You're thinking of M-Disc probably. 25 & 50 GB.capacities and yes they do require a burner rated for them. There are archival DVDs that are supposed...
Indeed, some of such services run at system level at start on boot, others are user specific (normally start after user login). In my case I suspect...
Please remember to use Windows tools to create/delete/move/resize Windows partitions and always run Windows defrag afterward. Use Linux/Ubuntu tools...
The developers have a choice. To quickly load the login screen and then cause the user to wait as all the services of an operating system are loaded...
