pbatard
commented
7 years ago I went through all the possible contention points, but I don't see anything that should prevent an UEFI compliant firmware from booting that drive:
Disk type: Removable, Sector Size: 512 bytesYour USB uses a standard sector size, so it shouldn't be a problem (some drives use 4096-byte sectors, and are not recognized for that reason, but that is not the case here)
Partitioning (GPT)...
(...)
Formatting (FAT32)...Your drive was properly partitioned as GPT and formatted as FAT32, so any UEFI firmware should be able to look at its content.
Extracting: D:\EFI\BOOT\BOOTx64.EFI (1.2 MB)An EFI\BOOT\BOOTx64.EFI file was extracted, so an UEFI firmware should detect that and present you with the option to boot from it. The fact that it's called EFI\BOOT\BOOTx64.EFI and not efiI\boot\bootx64.efi (or any other combination of case) shouldn't matter, as compliant UEFI firmwares should not bother about case, especially on a FAT file system.
Provided that you are using an x64 UEFI firmware on your Dell XPS 9550 (which I'm pretty sure is the case, especially as you mention the same ISO worked before, and it only provides an x64 boot loader), there's nothing obvious as to why your device should fail to be detected as UEFI bootable.
The log also shows that your USB creation completed successfully, so everything should be properly set for UEFI boot.
The one thing I would suspect, since you mention that your USB booted once, but not afterwards, is that the flash memory on your USB could be defective, but if you ran a bad blocks check, and it reported no errors, and tried a different USB flash drive, as you mention, then this hypothesis should be eliminated as well. Intermittent boot issues (worked some time, doesn't work other time) do suggest a problem with the hardware, as under the same conditions, software will behave in the same manner. But then again, that's why I ask to try plugging the USB on a different port, to eliminate the possibility of a connectivity issue, and you indicate that you try that.
So, if you have really tried everything from the check list, then I don't see anything I can advise you with. As far as I'm concerned, your USBs should boot, and if they don't, you will have to take that either with your flash drive manufacturers or Dell.
zachkont
lock[bot]
Checklist
Logbutton in Rufus and copy/pasted the log into the line that says<FULL LOG>below.Rufus version: x.y.z- I have NOT removed any part of it.Additionally (if applicable):
#button (at the bottom of the Rufus interface), to compute the MD5, SHA1 and SHA256 checksums, which are therefore present in the log I copied. I confirmed, by performing an internet search, that these values match the ones from the official image.Issue description
On my Dell XPS 9550 in UEFI mode (legacy mode is disabled) the bootable flash drives (for both windows and linux images) that I make in GPT/FAT32 with Rufus are not visible in the UEFI boot options. To be exact, the first time it was visible and would boot into grub but wouldn't boot into the OS (linux mint 17.3) so I thought maybe the ISO was corrupted and redid the operation, but after that nothing is visible.
I know it's probably not a rufus problem but what am I doing wrong?
EDIT: forgot to add that the boot mode is currently UEFI with Secure Boot
offLog