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How Bootable Devices Work in UEFI Boot Mode

Summary: Information on how bootable devices work in UEFI boot mode.

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Article Content


This article provides information on how bootable devices work in UEFI mode.

How bootable devices work in UEFI mode:

In order for BIOS to show a UEFI boot option for a fixed disk, there are only two possibilities:

  1. The fixed disk has this file: EFI\boot\bootX64.efi stored in the root folder

  2. The OS installer has created a boot option on the disk.

SLN288862_en_US__1icon Note: This boot option is only built during UEFI OS installation - the OS installer code finds the drive (blockIo device) to install the OS and create an boot option.

If the PERC HDD image was originally installed in legacy BIOS mode, none of the above would be true therefore there is no boot option for BIOS to list in the UEFI boot menu.

Removable media is treated differently:

BIOS always builds a boot option for them regardless of media presence.

The virtual media (virtual Floppy and Virtual CD) should show up in UEFI boot menu as removable device boot options. If they don’t show up then they must have been disabled.





Article Properties

Affected Product


Last Published Date

30 Sep 2021



Article Type