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Released in 2017, the Dell Inspiron 5570 is a 15-inch laptop with an Intel processor inside paired with a discrete AMD graphics card. It is also referred to as the "Inspiron 15 5570."

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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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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?

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Which OS? Are you sure you wrote the image to usb correctly? Did you try booting the drive from another pc?

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Windows 10 home. It works on other computers so idk

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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

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@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.

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@nick Why enable legacy boot then? First thing that came to mind was maybe the other machines on which the drive successfully boots all have good ol' non-uefi BIOS onboard, or it could be Dell's UEFI firmware not being able to detect his MBR partitioned drive even in CSM mode. Anyway thanks for the info, I'm not well acquainted with recent Windows OS installation process on new machines

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@simone_i It worked at the time, and I didn't want to mess with it - also plays nicer with Linux as well in some cases.

When I reinstalled, it had to be fixed. It was a configuration I was able to get away with because of the original 7 base installation I thought could be left be, but nope; straight Win10 wanted UEFI boot. OP has a Skylake era Dell, so it's one of the ones that if anything, are going to be as mature as the E6440 Haswell UEFI BIOS, or more mature.

I wouldn't consider the machine "new". New-ish maybe. If it was a Skylake-present system, I'd consider that new. Secure boot staying off stands because I need to do that for Linux. I could have installed Win7 as a base again and kept my old settings, but that makes no sense with a Win10 license since I can do it from scratch now. That's a reinstall with extra steps.

Dell has the legacy boot mode so it's there for compatibility reasons, but it may be gutted on the new systems unlike the early E6X UEFI systems (E6X00/6X10) which relied on it for XP compatibility.

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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...

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