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I just built new PC based on Asus Z87-Plus motherboard and in BIOS boot menu I now have my removable devices listed twice - once as a device itself and once with "UEFI: " prefix.
It looks like this for Blu-ray drive on SATA port 5:
P5: PIONEER BD-RW BDR-208M (3523 MB)
UEFI: PIONEER BD-RW BDR-208M (3523 MB)
USB flash drives are similarly listed twice.
Hard drives are only listed once as non-UEFI.
What are the implications of picking UEFI boot option vs non-UEFI? Why aren't hard drives available in boot menu with UEFI option?
Displaying only a single mode for the HDD might also be a quirk of your motherboard. See this page for a motherboard that allows the user to boot the same Hitachi HDD in either BIOS or UEFI mode.
– Karan – 2013-07-06T18:20:47.877But what is the difference between Windows installed in UEFI mode vs Windows installed in BIOS mode? – Joe Schmoe – 2013-07-06T22:05:51.573
3UEFI mode is supposed to have advantages such as helping boot up faster, support for Secure Boot (with Win8) and so on. Also, it's required for booting off GPT drives larger than 2TB (GPT also doesn't have the 4 primary partition limit that MBR does). Other than that Windows itself won't exhibit any difference in behaviour AFAIK. – Karan – 2013-07-06T22:48:03.260