volume hébergeant un système d'exploitation(A volume that contains an operating system (for example, Windows Vista) that can be loaded by Windows Boot Manager. A given system can have multiple operating system volumes. The operating system on the current volume can be started only if it has an entry in the Boot Configuration Data (BCD))
volume système(The first volume that is accessed when a computer starts up. This volume contains the hardware-specific files that are required to load Windows and includes the computer's boot manager (for loading multiple operating systems). Generally, the system volume can be, but is not required to be, the same volume as the operating system volume)