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Re: Trouble making bootable USB from ISO image




Thomas Schmitt wrote:

> So you could use a partition editor to create an MBR partition of type
> "EF" which begins at 512-block 515 * 4 = 2060 and has 2,590,860 * 4 =
> 10,363,440 blocks.
> (The EFI image is probably smaller. But El Torito can mark only sizes
> up to 32 MiB or unlimited size. Microsoft decided for unlimited. So
> the only limit is the ISO's end.)
> 
> MBR partition is less tricky than GPT. If it must be GPT, then create a
> partition of the proposed start and size and Type GUID
> C12A7328-F81F-11D2-BA4B-00A0C93EC93B . (Do this only if the ISO is already
> copied to USB stick. Putting GPT into the image file could overwrite its
> last few blocks by GPT backup.)

don't forget that to create UEFI bootable partition, you need to boot in
UEFI. It does not work if you boot in legacy MBR - unfortunately - it took
me 1 day to find out :)