Hi, so I'm looking to try out UNRAID and I've followed all of the instructions mutliple times, tried downloading older versions, using the troubleshooting things and what not, but I still cannot get this to work for whatever reason. My specs are as follows, Core i5-7600K on ASRock Killer Z270 SLI/ac with 16GB Teamgroup RAM (2x8GB) and WD BLUE m.2 ssd. I'm trying to boot from a SanDisk Ultra Flair 32GB flash drive, each time I do, it says operating system not found, I've booted off of this flash drive before when installing windows and linux on both this machine and other machines. I've run the make_bootable.bat multiple times, reformated the flash drive and what not. Any clue on how I can get it working?

In my experience it's an issue with the make_bootable or your boot drive priority in bios settings.

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i've changed the priority or I've used the F11 option my MoBo has for booting from a given boot device. The one thing that I've noticed is that when I was installing other things, it would have a UEFI usb variant as well, but this does not, I've enabled secure boot, perhaps I should turn that off?

This is the contents of my make_bootable.bat

@echo off
:: v1.0 - script to make the USB Flash device from which this is run bootable.
:: v1.1 - script authorization check code contributed by forum member "Spectrum"
:: v1.2 - include 'f' switch to syslinux invokation to handle devices not marked "removeable"
:: v1.3 - make "script authorization" and "volume label" check language independent
:: v1.4 - add check of syslinux executable presence

echo Make Bootable v1.4

:: check script authorization
net session >nul 2>&1
if not %errorlevel% equ 0 (
	echo ERROR - script must be run as administrator
	echo:
	echo Right click and select 'Run as administrator'
	echo or execute from an elevated command prompt.
	goto:end
)

:: check syslinux executable
set syslinux=%~d0\syslinux\syslinux.exe
if not exist %syslinux% (
  echo ERROR - syslinux executable not found, expected: %syslinux%
  goto:end
)

:: output volume information
vol %~d0

:: check volume label
set tag=UNRAID
set label=
for /f %%v in ('vol %~d0^|findstr %tag%') do set label=%tag%
if not defined label (
  echo ERROR - volume label must be %tag%
  goto:end
)

:: make bootable
echo Ready to make disk bootable!
pause
echo %syslinux% -maf %~d0
%syslinux% -maf %~d0
echo Completed

:end
echo:
pause

 

29 minutes ago, undermark5 said:

I've enabled secure boot,

 

Secure boot must be disable for unRAID (or any other OS using bios) to boot.

Even with it disabled I haven't gotten it to boot it still says the operating system is missing.

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I would go back and recreate the flash drive using the latest download of unraid and make sure you're following the instructions to the t. And make sure you're actually booting from the USB drive and disabling secure boot.

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I've done that one more time on top of the 20 or 30 times I've tried doing it, I even tried booting from it on an older machine that doesn't have uefi or secure boot and what not, same exact error. Why can't they just give me an iso and I use Rufus or another tool to make bootable flash drives with???

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Did you format to FAT32 using Rufus? If not, try it.

I can't use Rufus, it needs an iso, which doesn't seem to exist for whatever reason, but I've followed the directions to a t and formatted it to FAT32 in Windows using the built in utility as per the instructions.

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12 minutes ago, undermark5 said:

I can't use Rufus, it needs an iso,

Uncheck the box that says "Create a bootable disk using" and just format FAT32 with a volume label of UNRAID

Oh, well, I went in a round about way and made myself a bootable iso that I then used to make a bootable flashdrive from. And that worked.

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The built in windows format tool is pretty brain dead, many times you have to format using a more powerful tool.