4GB or higher for Windows 7 and above
Right click start menu, click command prompt (admin)
diskpart
list disk
Exmaple Output
Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 238 GB 0 B *
Disk 1 Online 476 GB 0 B *
From the output of list disk, select the number of the USB drive that will be bootable
select disk 2
Disk 2 is now the selected disk.
THIS WILL DELETE ALL DATA ON DRIVE
clean
create partition primary
select partition 1
format fs=ntfs quick
active
This will exit diskpart, but leave cmd open
exit
If the OS is in ISO format, it needs to be mounted and extracted
Example if OS contents is on root of I drive:
I:
This example is if USB is the L: drive
cd boot
bootsect.exe /nt60 L:
This example is done with the OS being on the root of I: and the flash drive as the drive L:
xcopy I:\*.* L:\ /E /H /F