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Boot order question

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#1 melvil83


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Posted 11 November 2015 - 03:46 PM

I have a theoretical question. Let's say I have a computer with 3 internal drives (and an ASUS motherboard) and I insert 2 USB sticks.
The boot order in BIOS is as follows:
1. HDD
2. USB
3. CD-Rom.
The boot order for HDD is: 1. HDD x
                                           2. HDD y
                                           3. HDD z.
The boot order for USB is: 1. USB 1
                                          2. USB 2.

What I would like to know is: What is the booting sequence?
- HDD x, USB 1, CD-Rom
- HDD x, HDD y, HDD z, USB 1, USB 2, CD-Rom?

Thank you.

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#2 RolandJS


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Posted 11 November 2015 - 03:54 PM

You and I have desktops, correct?  Assuming yes:  In my computer's BIOS:

-- if there is no USB stick detected during choice-making, it will simply default to preset cd/dvd hdd boot sequence[s].

-- if BIOS detects USB stick or sticks, you can set a USB stick cd-dvd hd sequence, eventually, I have to go through 3 separate sequences to get what I want.

  Your ASUS motherboard might do somewhat differently than my G-byte motherboard concerning the present or absence of USB sticks during BIOS setting and during the actual post/boot process itself.

Edited by RolandJS, 12 November 2015 - 03:36 PM.

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#3 hamluis



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Posted 12 November 2015 - 02:21 PM

The boot order cannot list every hard drive...it is only the first hard drive which is in the boot order, as long as the basic order is HD...USB...optical drive. 


The system does not go down the list of hardware items installed...it goes by the specified order.


Try it on your system and you will see this.


If you designate the wrong drive as the #1 HD...and the HD is your first boot device...you will get a "non-bootable device" error, since you have elevated a non-bootable drive to the be #1 drive.



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