On basic master boot record (MBR) disks, marks the partition with focus as active. Syntax: ACTIVE This informs the basic ...

On basic master boot record (MBR) disks, marks the partition with focus as     active.  Syntax:  ACTIVE      This informs the basic input/output system (BIOS) that the partition is a     valid system partition.      A partition must be selected for this operation to succeed.      Caution:          DiskPart verifies only that the partition is capable of containing the         operating system startup files. DiskPart does not check the contents of         the partition. If you mistakenly mark a partition as active and it does         not contain the operating system startup files, your computer might not         start.  Example:      ACTIVE