Do you want to choose uefi or legacy mode for U disk startup?
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New computers now use uefi gpt boot mode to adapt to win 8, win 10 these new operating systems, but most systems before win 7 do not support uefi, but use legacy boot mode, hard disk partition table is mbr, not gpt.
Operating environment: Windows 7, Dell G3 PC.
It depends on which computer system is used. If you install win7 64, please select legacy only or old preference, and see if there is a secure boot option in bios, if there is, set it to disable.
Because now the new computer is using uefi gpt boot mode, to adapt to win8, win10 these new operating systems, but most of the systems before win7 do not support uefi, but legacy boot mode, hard disk partition table is mbr, not gpt, if you want to install the system before win7 in the new model, you have to change uefi to legacy, and then change the hard disk partition table gpt to mbr.
Additional information:
Legacy+UEFI mode differs from UEFI mode:
Legacy+UEFI boot mode is based on some computer hardware devices and operating systems (such as WinXP/7) do not support UEFI-based BIOS, consider booting from traditional BIOS boot mode. Legacy BIOS boot mode allows Hba, modular devices to use the Rom option.
UEFI boot mode is used to automatically load the operating system from the pre-boot operating environment to an operating system, thus simplifying the boot program and saving time. And support more than 2T hard disk, strengthen the support for hardware, Win8 boot speed is fast, and Win8 native support UEFI mode is not unrelated.
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