@ksaj
I'm sorry I don't cover that, or why any of them. I'm mostly an end user and not a software engineer (I'm a hw engineer, but that's another story). But as a user, it makes sense to me to unmount all file systems; unmount internal disks, external disks, USBs and so on to keep them in order. Isn't that done also in a normal turn off? Or have I misunderstood what u is doing.