Bootable USB flash drive not detected by the BIOS

biosbootusb

I spent few days trying to install the Windows 10 ISO on my laptop:

I reset my BIOS settings, since it didn't work, yet still nothing. The USB doesn't appear in the BIOS menu.

Any suggestions?

Best Answer

Some BIOSes only re-enumerate USB drive 'types' on a cold boot. This means that if you change the partition\format structure of the USB drive, on some systems you must power them off and on again. If the system always stays on and you use crtl-alt-del or restart to begin a USB boot session, the BIOS may not 'notice' that you have changed the 'type' of partition. For instance, Windows will format a raw, unformatted USB flash drive as a floppy drive (no MBR). This won't MBR-boot correctly. If you use a new partition/format tool to change the partitions to a HDD MBR type of drive, the BIOS will still treat the USB drive as a USB:FDD drive and not a USB:HDD drive unless you reset the CPU or power-off and in again. This type of BIOS is rarely found these days, but it is worth remembering this 'gotcha'!

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