Weird Yet Pleasant Finding On USB Booting

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  1. Posts : 18,453
    Windows 11 Pro
       #11

    How about if we put this to rest with the facts? Here is the UEFI specification:
    https://uefi.org/sites/default/files...2_10_Aug29.pdf

    You will find that on printed page 443, it states that UEFI must be able to boot from a FAT partition. In the UEFI specification there is no requirement that UEFI be able to boot from an NTFS partition. There is also no requirement that the system disk must be GPT - it can be either GPT or MBR.

    Some computer manufacturers have taken the extra step and included the ability to boot from NTFS partitions in UEFI mode in their firmware. This is the exception rather than the rule. Most manufacturers only meet the requirements of the UEFI specification and nothing more.

    It has nothing to do with USB 2.0 v. USB 3.x. It is 100% whatever optional capability the manufacturer decided to include into their firmware.
      My Computer


  2. Posts : 1,204
    11 Home
       #12

    As defined in the UEFI Specification, to be able to boot in UEFI mode from an EFI partition it must be FAT32 or, on removable media, FAT16 or FAT12. The EFI firmware uses its own internal driver for this so no other driver needs to be loaded by it. The ability to load a different driver for this specific purpose [UEFI mode booting from a local storage device] is not included anywhere in the UEFI Spec. See:
    13. Protocols – Media Access — UEFI Specification 2.10 documentation
      My Computers


  3. Posts : 1,204
    11 Home
       #13

    NavyLCDR said:
    How about if we put this to rest with the facts? Here is the UEFI specification:
    https://uefi.org/sites/default/files...2_10_Aug29.pdf

    You will find that on printed page 443, it states that UEFI must be able to boot from a FAT partition. In the UEFI specification there is no requirement that UEFI be able to boot from an NTFS partition. There is also no requirement that the system disk must be GPT - it can be either GPT or MBR.

    Some computer manufacturers have taken the extra step and included the ability to boot from NTFS partitions in UEFI mode in their firmware. This is the exception rather than the rule. Most manufacturers only meet the requirements of the UEFI specification and nothing more.

    It has nothing to do with USB 2.0 v. USB 3.x. It is 100% whatever optional capability the manufacturer decided to include into their firmware.
    Ahh, you beat me to it. lol
      My Computers


 

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