I wanted to create a Win 10 Boot Disk from an ISO recently but ran into some issues with the various methods available.
The Official Media Creation Tool creates a bootable USB disk but what if you had a bunch of ISOs that you were testing or didn’t want to download Windows again using MCT just to create boot disk? The other issue with MCT is the sources folder of the final USB disk contains an ESD and not a WIM file which you then have to convert if you are doing any WIM Image customisation.
Usually i would use Rufus but found there is now a warning in the boot disk creation process which asks you to disable Secure boot in order for the USB disk to run. This means you need to disable Secure boot to run the boot disk then re-enable it after.
I thought there must be a way to do this using Disk Management built into Windows. It can be done and allows the boot disk to boot with Secure boot enabled or disabled.
The process takes 5 minutes to complete and requires 2 partitions to be created.
- Insert a formatted USB disk into your Computer.
Open Disk Management by right clicking the Start Menu > Disk Management
Delete any existing partitions. It should show the entire space as Unallocated.
2. Right Click the Unallocated space of the USB disk at the bottom and select > New Simple Volume
3. Set the size of the volume 1000 MB > Click Next
4. Choose letter A in the dropdown > Click Next
5. Select File System: FAT32, set the Volume label to: BootA > Click Next. That should complete partition 1 (BootA)
6. Right click the remaining Unallocated space and select > New Simple Volume
7. Set the volume size as the remaining Unallocated space. This should be pre-filled > Click Next
8. Assign the letter B > Click Next
9. Select the Format option, Choose File System: NTFS and set the volume label as: BootB > Click Next
10. Your USB disk is now setup and should look similar to below:
11. You now need to mount the ISO file
12. Copy all contents from ISO source folder to B: Drive (Boot B)
13. Copy only the following Folders/Files to A: Drive (Boot A):
boot folder including contents
efi folder including contents
create a new folder: sources > copy only one file from B Drive sources folder: boot.wim
The above files should be copied and not moved so they are in both drives.
14. All done. You should now be able to boot from the USB disk and clean install Windows