How to boot a Lenovo G580 from disk

Okay! Apologies if I've missed this exact same post somewhere, I Googled for literally days and couldn't find a sausage about how to boot my Lenovo G580 from disk but I've finally, by accident, found the answer!
So, when you go to the boot menu, it'll look something like this:
(Note: this image is taken from Google, I had no way of taking a picture of my own)
Now, if you're like me, you would think that in order to boot the laptop from a disk, you'd need to re-order so that the highlighted line was at the top! Makes sense, right? Well let me tell you, I don't know what the heck that is but it sure ain't the right option to boot from disk. You need to actually make the 'USB CD' option the first one and viola! It works! I did it on a whim because I'd tried everything else, why not right? Turns out I'm the luckiest person in the world and I did a victory lap of the house.

Hi Daniel,
thank you for your reply.
I just checked again if I can boot the RT-system without the floppy disk, from harddisk only - but that doesn't work ("DISK BOOT FAILURE, INSERT SYSTEM DISK...").
Of course, the boot order in BIOS is set up appropriately to allow booting from harddisk.
And also, the complete software package was already installed on harddisk via MAX through the previously configured network connection.
Actually, it seems there is no boot loader installed on harddisk at RT-systems for desktop-PC's.
The boot loader has to be launched from the floppy boot disk and afterwards, the further boot program is loaded from hard disk.
Is there anyone who can boot a desktop-PC into RT without the floppy disk? And what do I have to set up in order to make it work for our system?
Thanks,
Tom S.

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