how do i arrange these?

[Mark_moz]

the boot from menu....the devices?
HDD, LS120, Cd/dvd, then usb....?

 

[Pr3di]

If this is for day to day use, put the HDD first.
If you are planning to install Windows on your PC, set the CD/DVD or USB first, depending on what you`re using to install the OS from.
If you`ll install the OS directly from your PC, the HDD will need to remain the 1st one.