how to make a boot disk for toshiba satellite c855d

In the F12 menu, it just said USB when it should have said USB Kingston DataTraveler so I thought I haven’t made a bootable USB or that I must use CSM (which you shouldn’t ever use). My BIOS was not working correctly, and it didn’t register my USB drive. Hold F12 while booting to get to the boot menu, and select your USB.To boot this drive after many hours of trying, sadly only because of a bug: Mounted Ubuntu iso with Windows 8.1, copied all the files from it to the USB.Formatted my trusty Kingston 2GB drive with diskpart (select disk X, clean, create partition primary, select partition 1, active, format quick fs=fat32.So for example, I wanted to try Ubuntu 15.04 on my machine (Toshiba Qosmio X70-A-12X) so I did the following: To make UEFI flash drive, you don’t need any special tools, you just need FAT32 formatted usb drive with an active partition and EFI folder on it. There is a ton of advice, like to switch to CSM boot mode, but that defeats the point of UEFI. If you have InsydeH2O bios, you may have some trouble booting from UEFI flash drive (with linux or Win8 or higher).

MaBooting UEFI USB stick on a Toshiba laptop (InsydeH20 bios)

How to make a boot disk for toshiba satellite c855d