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We have a machine with an Asus P7P55D-E LX motherboard. We're trying to set the default boot device to a USB attached flash drive.

We set up "Removable" as the first and only boot device in the BIOS Boot options, but it refuses to boot, UNLESS we press F8 at POST and manually select the USB option.

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up vote 4 down vote accepted

In Bios, it should give you the option for your USB specifically to boot from.

Try this:

In Bios, go to Advanced, USB Configuration, USB Mass Storage Device Configuration and set Emulation Type to Hard Disk.

Save and exit.

Enter Bios again, and go to Boot/Hard Disk Drives and see if USB Storage Device (it could display the name of the drive for example: Sony thumb drive)is now available in the list. Move it to the first boot slot. Save and exit.

Edit: you should probably have your CD/DVD drive as first, then your USB device after you confirm that the USB device boots up.

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We tried that, but still the only options in "Boot Devices" are "Removable, SATA, CDROM, Disabled" ... and "Removable" still won't boot from USB. Tried a different USB port, but didn't help. –  Ze'ev Aug 22 '12 at 16:33
    
We had to change USB mode to "Legacy" in the Advanced menu. Now it's working! –  Ze'ev Aug 22 '12 at 16:42
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+1: The restart between the two steps IS crucial (even if you have the USB listed in the boot priority list... might be from a different emulation setup...) –  masu Jan 23 at 17:36

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