I am getting problem while installing windows 7 on my single partition hard disk. I am using bootable USB drive for the installation. The error I get is "Setup was unable to create new system partition or locate an existing system partition. See the setup log files for more information". When I opened the setup log file(setuperr.log), it shows the error "Couldn't find boot disk on the BIOS based computer". Have anyone got this error before. Please help!!

More Info:

Boot Sequence:USB, Harddisk

System: Dell Inspiron 1545

  • Should probably be on SuperUser. If others agree, the question will be automatically migrated there for you. :-) Commented Aug 8, 2011 at 19:45

2 Answers 2


I got this same error, setting the hard disk as 1st (and even removing the USB stick from the boot order) did not help. As far as I can tell, this is some interaction in the BIOS that prevents the win10 installer from thinking that the installation target drive is bootable, perhaps due to the particular USB key I was using (a USB 3.0 Kingston DataTraveler). I solved it by creating an "install partition" on the target disk using diskpart from the command line (shift+F10 in the installer):

> diskpart
diskpart> list disk
diskpart> select disk 0   # Choose the disk you want to install to
diskpart> clean           # will delete everything, hope you have backups!
diskpart> create partition primary size=100000 # size in MB
diskpart> create partition primary size=5000 # temporary install partition
diskpart> format fs=ntfs quick
diskpart> assign          # assigns a drive letter, it was D: for me
diskpart> active          # makes the install partition bootable
diskpart> exit

then copy the installer files from the USB key to the temporary partition:

c:\> xcopy c: d: /e /h    # /e for recursive with empty, /h for system files

and reboot, remove the USB key, and boot from the temporary install partition. The win10 installer will detect that the disk is bootable this time through & will let you install. When you're done with the installer you can remove the temporary partition and resize your main partition to take up the whole disk.

  • How can i know which drive is the temporary partition and which is usb?
    – neogeomat
    Commented Nov 6, 2015 at 14:07
  • This finally worked. Tried a lot of options, this is failsafe.
    – neogeomat
    Commented Nov 6, 2015 at 14:28
  • This also seems to work for Windows 10 (and a USB2 key which was causing the problem).
    – Manux
    Commented Sep 30, 2016 at 21:12
  • 1
    In diskpart, you might use list volume to know which letter is which partition. Also, note that xcopy arguments order are first origin and then destination. Commented Nov 27, 2016 at 23:15
  • Please How can I boot from the temporary install partition on my laptop Asus UX310U
    – Educ
    Commented Dec 9, 2019 at 20:08

Try setting the Hard Disk as boot order 1 and USB as order 2. While the PC is booting hit F12 during the POST and select the USB drive.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .