O to create a new empty DOS partition table Enter sudo fdisk /dev/sdc and then following options:

BIOS/CSM will only boot if partition is marked active, UEFI doesn't care so mark it active.Īssuming your USB key is sdc (check with lsblk) you can do this as follows:Ĭreate partition table and partition using fdisk.

If you had larger files you could make separate FAT and NTFS partitions and include a UEFI NTFS driver but this is not required. The largest file on the Hiren's Boot.wim is 1.32GB and as this is less than 4GB there is not reason not to use FAT32. UEFI may boot from NTFS (if there is a UEFI driver in firmware) but will definitely boot from FAT.

BIOS/CSM will boot from either FAT or NTFS.

BIOS/CSM will only boot Windows from MBR partitioned drives while UEFI will boot from either MBR or GPT so you want MBR partition scheme.

If you want a USB that can boot on either BIOS/CSM or UEFI you need to format it with a MBR partition table containing a FAT32 partition marked active.

The same procedure will work with other pre-built PE (such as Kyhi or Gandalf) or a Windows ISO as long as the.

You can therefore simply copy the contents of the ISO onto a suitably formatted USB key. The Hiren's BootCD PE contains both BIOS and UEFI loaders.

Windows burn linux iso usb