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It depends on what mode you boot the USB flash drive in.
In summary, a flash drive partitioned with MBR and a FAT32 partition marked as active will boot in either legacy BIOS or UEFI mode. If it is booted in legacy BIOS mode, Windows setup will make the target drive MBR. If the flash drive is booted in UEFI mode, Windows setup will make the target disk GPT.
So let's resume,I choose UEFI or BIOS and MBR as partition table and installation will work on all machines no matter if the disk is formatted in GPT or UEFI?Right?
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Now I'm totally confused...guys just tell me what to choose under partition scheme and target system?
I want to use one USB W10 installation on my desktops who have UEFI and on my laptops who are on old BIOS mode.
It sounds like you're confusing how the USB is created with what to do on the computer. These are two separate things to do.
For what you want, you would use step 6 in option 2 with Rufus to create a Windows 10 installation USB that can be used to install Windows 10 with either UEFI or Legacy BIOS.
When you are ready to clean install Windows 10 with this USB, you need to do step 3 in the tutorial below on the computer you want to install Windows 10 on to set if you want UEFI or Legacy BIOS on the computer.
Clean Install Windows 10
After creating a USB device as Brink said above, when you start your desktop, on the boot menu, select the USB device with the "UEFI" prefix. Click here to see my example. As for your old laptop, UEFI will not be available, so you can only install Windows in Legacy BIOS mode.
Use MiniTool Partition Wizard to check whether it is GPT or MBR. If it is MBR, you may convert it into GPT. See: Convert MBR Disk to GPT Disk in Windows 10
... as long as the disk is blank.
Just checked,on my desktop is GPT but on laptops is MBR.
I made installation as you said choose MBR and BIOS (UEFI with CMS support).
Is that okay?
And I understood,if I want to install it on desktop I boot from "USB device with UEFI support) if it's Kingston that means UEFI:Kingston 2.0 something like that right?