On disks with master boot record (MBR) disk formatting, marks
the partition with focus as active.
Syntax: ACTIVE
Writes a value to the disk which is read by the basic input/output
system (BIOS) at boot. This value specifies 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
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