[How to] Make partition Active or Inactive using DISKPART

The system will boot from the partition only if it has Active flag set.

To make partition Active:

1. Run Command Prompt as Administrator
2. Type:
   

   diskpart

3. Type:
   

   list disk

   Remember the desired disk number

4. Type:
   

   select disk #

   where # is the desired disk number

5. Type:
   

   list partition

   Remember the desired partition number

6. Type:
   

   select partition #

   where # is the desired partition number

7. Type:
   

   active

To remove Active flag:

1. Run Command Prompt as Administrator
2. Type:
   

   diskpart

3. Type:
   

   list disk

   Remember the desired disk number

4. Type:
   

   select disk #

   where # is the desired disk number

5. Type:
   

   list partition

   Remember the desired partition number

6. Type:
   

   select partition #

   where # is the desired partition number

7. Type:
   

   inactive