Hi Joachim,
did now the full installation chain in legacy mode (mediawriter - iso - F26 Beta 1.3 build) all worked fine.
If You think it's the usb stick, test with F3. If I get problems with one of my usb sticks, I make a new partition table on the stick with gparted, if gparted can not delete a fedora partition, I try a new Fedora install on this stick and interrupt this process, before the new data are written, by doing this afterwards gparted always "repaired" an usb stick which had only a SW corruption and no hardware defect.
Kind regards Joerg


-----Ursprüngliche Mitteilung-----
Von: Chris Murphy <lists@colorremedies.com>
An: joachim.backes <joachim.backes@rhrk.uni-kl.de>; For testing and quality assurance of Fedora releases <test@lists.fedoraproject.org>
Cc: Joerg Lechner <julechner@aol.com>
Verschickt: Mi, 31. Mai 2017 19:06
Betreff: Re: Fedora-Workstation-Live-x86_64-26_Beta-1.3.iso doesn't boot from usb stick

On Wed, May 31, 2017 at 8:28 AM, Joachim Backes
<joachim.backes@rhrk.uni-kl.de> wrote:
> On 05/31/17 13:54, Joerg Lechner wrote:
>>
>> Hi Joachim,
>> I have prepared iso s on USB sticks, both 2GB and 64GB each, the iso s -
>> F26 Beta 1.3 - prepared with fedora mediawriter on F24 in UEFI mode, the iso
>> s boot correctly in EFI mode as well as in Legacy mode. But so far I could
>> not prepare a F26 iso running in Legacy mode, can there be a difference
>> producing the iso boot medium in Legacy compared to EFI?
>> Kind regards
>
>
> Hi Joerg,
>
> I wrote the iso with mediawriter-4.1.0-1.fc25.x86_64 in F25 onto the USB
> stick, but if booted, it hangs up during "loading initrd.img".

This is before media check runs.

Bootloader > load kernel, load initramfs > execute kernel > unpack
initramfs > systemd runs > dracut pics up the boot param to check
media > checkiso executes and checks the media


So your failure is happening at the 2nd step, you're still in the
bootloader. This is almost certainly a USB stick problem. I'd just
write the image again and maybe it'll fix itself as a transient
failure. If not, the try another stick.





--
Chris Murphy