Yes, UEFI-boot must be enabled before OS installation, cause OS must mark drive to GPT-style partitioning and create special EFI boot partition (and place own boot module there). If you installed OS without EFI, you can not switch to EFI without OS reinstall and, probably, whole drive cleaning and repartitioning. In case of Windows OSes, only 64-bit Vista & 7 currently support UEFI-installation.
UEFI currently have no real advantages to home users in terms of speed or reliability except the capability for booting from more than 2 TB sized HDDs.
Thank you very much!
I anyway am going to install again because it takes not so much time anymore like 10 years ago!
Do the three options for FAST BOOT have to be set "disabled" during installation?
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Don`t touch BOOT optimizations in BIOS entirely, some of them may result, for example, keyboard inaccessibility at start-up time and you will be forced to CMOS reset. Just enable HPET and all virtualization features if you know how & where to use them. Also, if you plan for RAID system in future, you must select SATA mode to "RAID" in BIOS now, even if currently you have only one HDD/SDD in system, cause else later you will be forced to another OS reinstall for RAID configuration.
Just enable HPET and all virtualization features if you know how & where to use them.
I tried but I could not find the "HPET"-Keyword anywhere in the customer-PDFs and also not in the BIOS.