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    One possibility: as an SSD dies, it goes into read-only mode. That may leave it accessible, but not bootable. Commented Nov 17, 2023 at 19:36
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    Was Windows installed in Legacy Mode? The only reason you would enable CSM is if that’s the case. It makes no sense to enable RAID mode if Windows was installed with it enabled. For your own sanity stop disabling and enabling options, that were not disabled or enabled, because by doing so you only lessen the chances we can help you. Your suspicions that this an EFI are spot on, but CSM is incompatible with UEFI Windows installations, and enabling RAID mode wouldn’t solve an EFI partition problem.
    – Ramhound
    Commented Nov 17, 2023 at 19:58
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    @DrMoishePippik Maybe. But it's a relatively new SSD. Also, this doesn't explain why the USBs don't boot. Commented Nov 17, 2023 at 21:50
  • @Ramhound Unless I remember wrong, it wasn't installed in legacy mode. I tried these different settings to get the USBs to work. I don't know why they only boot when RAID mode is selected. Commented Nov 17, 2023 at 22:05