How to combine two DVD-9s to one DVD+/-R DL?

Step 1: Run DVD-Cloner and select the "Combine multiple DVDs to one DVD±R DL or BD-R(DL)" copy mode on the Expert interface.
Step 2: Specify the source DVD disc and the target DVD burner and then click on "Next".

Note: You can also select a source DVD movie from the hard disk.
Step 3: Select the "Combine two DVDs to one DVD±R DL" option and then click on "Next".
Step 4: Select a menu background, change the background picture (If you don't change the background picture, it will use the default picture.) and define the disc volumes and then click on "Next".
Step 5: Affirm the copy configuration and click on the "Start" button.
Step 6: It starts reading the first DVD disc. After the reading of the first DVD is completed, it will prompt you to insert the second DVD disc. Click on "OK" and it will begin to read the second DVD.
Note: You can also select the second DVD movie from the hard disk to read instead of inserting the second DVD disc.
Step 7: After the reading is completed, please insert the target DVD±R DL, close the drive and click on "OK". Then it will start burning.
Step 8: Completed!

Updated : Jul 29, 2021.