I have some computers that we will reinstall the OS to hopefully "refresh" the machines so they run better until replaced. I have a custom XP install CD with the image these machines need. It is on a DVD. However the computers, Dell Dimension 3000 machines, do not have DVD ROM drives. Before I go through the effort of manually moving a dvdrom drive to each machine (they are dusty from about 3 yrs of use and I really want to save that work and headache) I am hoping a can find a way to install from USB.
Initially I didn't think this would be an option because I figured the machines wouldn't support it in the BIOS. They do though and it seems to work (at least booting to a USB thumb drive). Now I am finding the hard part is actually getting the image on the usb thumb drive and getting it to be bootable. I have take a look at UNetbootin and SARDU, which have been recommended in other solutions here. However since I have the custom image I seem to be having a problem using them. SARDU doesn't see it and UNetbootin, after spending all day copying it and making the drive, didn't list it in the menu that appeared.
I have also tried (and will try again because I heard it should work) a USB DVD drive. However that didn't seem to be recognized by the BIOS so I couldn't select the boot to USB option.