Windows7 system disk management extended partition creation method

In win7, the default disk management does not have the option to create extended partitions, you can only create 3 primary partitions before you create the extended partition by default, to create an extended partition directly Must be operated by cmd, specifically create method steps:
Run CMD into the command line
then run DISKPART, enter DISKPART
run LIST DISK, display the disk list. If there are two disks connected, 0 and 1 will be displayed, where the master disk is 0, the slave disk is 1
Run SELECT DISK 0, select the first hard disk
and then enter CREATE PARTITION EXTENDED to create an extended partition.
Note: This extended partition will include all free disk space.
To limit the size of the win7 extended partition, you need to use the parameter size to limit it later, such as size=1000 (the default unit is MB).