无损分区The volume from which a machine starts. If no operating systems other than Windows are installed on your machine, the active volume is typically the same as the system volume (p. 81). If an operating system other than Windows, such as Linux, is installed on your machine, the active volume can be the volume where the program known as a boot loader, such as GRUB, is stored. The active volume is either a primary volume (p. 79) (on a basic disk) or a simple volume (p. 80) (on a dynamic disk). Only one volume on a disk can be act ive. The active volume on a basic disk is also called the active partition.