Boot discs that boot on BIOS don't boot on UEFI?

[dbminter]

My new PC is my first exposure to UEFI.

 

 

I have a few bootable CD's for applications that used to boot on my old BIOS based Dell XPS 8300 but only one of them boots on my UEFI based Dell XPS 8700 PC!    This one application has specific options in its bootable media creator to enable UEFI.  The discs are simply not recognized as bootable in the 8700's F12 bootable menu interface.  Only the Macrium Reflect media is recognized as bootable.

 

 

So, I guess my question is do bootable discs that booted on BIOS based computers not necessarily boot on UEFI ones? 

[dbminter]

Had to disable Secure Boot in the UEFI to enable legacy booting to boot those CD's.

 

 

So, the answer is yes and no.  Yes, the discs will boot on UEFI but no they won't boot with Secure Boot on.