Why does my pc not recognize the os on my usb drive
I have changed the boot mode to legacy and changed the order so it checks the usb first but it doesn’t work it says missing operating system
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Hi @Mark Emmo,
Check if the following options are enabled in BIOS or at least the first one
BIOS > System Configuration > USB Configuration >
Enable Boot Support : Enable or disable booting from USB mass storage devices such as external hard drive, optical drive, and USB drive.
Enable External USB Port : Enable or disable booting from USB mass storage devices connected to external USB port.
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Your BIOS may be different from my Dell, but this is how I have mine setup for USB boot after I reinstalled Windows 10. I would try setting the following on it, but I will also give you visual clues. I HAVE seen this BIOS on a 9th gen Inspiron desktop, so I’m thinking Dell may have changed things in recent years and switched over to one BIOS skin.
- USB Configuration: Enable Boot Support and External USB boot
- Boot sequence: Make sure UEFI is enabled and Windows Boot Manager is first. UEFI Hard Drive should be next.
Once you make those changes, press F12 and select the USB flash drive. At this point, you should not have an issue but you may need to temporarily disable Secure Boot. I personally leave it off permanently, but it does have some security benefits for average users which justify re-enabling it. I sometimes run Linux on my systems, and few distros properly support it.
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Windows 10 Home will not boot in Legacy Mode. In order for the computer to recognize the USB, you will have to change that setting back.
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I pulled it off, but it requires a pre 7th gen PC, Windows 7 and a Win10 upgrade. Straight Win10 does, but that's because it uses GPT and the Legacy option on my Dell fails because of the automatic conversion to GPT once you delete the old partitions if you intend to start over.
Not sure if this works on Win8 PCs but my XPS 8500 was particular since it's UEFI. I can't stand UEFI because it's got too many babysitters in the chain because if one thing is off, something throws a fit. If it wasn't for the Legacy 2TB boot drive cap I'd still favor legacy...
12 opmerkingen
Have you tried other USB ports, does the USB indicator light show itself lit, and have you confirmed the media actually works on another machine?
door SparkWorx
Which OS? Are you sure you wrote the image to usb correctly? Did you try booting the drive from another pc?
door Simone
Windows 10 home. It works on other computers so idk
door Mark Emmo
You mentioned enabling legacy in BIOS, which tells me your is not a UEFI installation. Your system seems quite recent though, I may be wrong but according to this table (https://pcrepair2000.co.uk/blogs/uefi-mb...) installing Windows in CSM boot mode still requires a UEFI bootable USB drive
door Simone
@simone_i Ran into that issue on my E6440, which is from 2013 (Haswell). My XPS 8500 from 2012 (Ivy Bridge) also has a similar issue. XPS still runs 8.1, and my E6440 is a 10 Pro system.
WIn8 and Win10 absolutely want the UEFI boot setting and UEFI boot drive on these modern BIOSes. I had zero luck booting any other way. The Dell UEFI BIOS was too mature around Ivy Bridge to legacy boot 8/10. It was fine when I went 7>10 because 7 is okay with legacy boot, but once I wiped out the old 7>10 install and clean installed Win10 20H2 (no upgrade) after a boot issue it needed to be changed.
door Nick
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