RedFirePhoenix

For some reason I'm having the hardest time understanding how to do this. I'm trying to create a bootable disk of the hard drive diagnostics program for a Seagate hard drive. I have a copy of the ISO saved to my desktop, which I know to write to a disk, but how do I make sure the program is bootable? I could only find one blank disk around my house so I have to get it right the first time!