It is recommended that the destination partition is formatted as NTFS (could be FAT32 on USB flash drive so USB is bootable on BIOS or UEFI firmware).
Let's assume the destination drive/partition is mapped to drive H. Using FAT32 format allows booting flash drive on UEFI and on BIOS firmware! To make a bootable USB flash drive (MBR style layout) we need only one single FAT32 partition which holds boot files and OS files. Suggested layout of GPT partitions for UEFI based PCs is:
Many UEFI boot problems can be solved by assuring that ESP and MS Reserved partitions are present on disk! MS Reserved partition(MSR), special Microsoft partition which is exactly 128 MB in size, no formatting.(Beginning in Windows 10, the size of the MSR is 16 MB.) On GPT style disks boot sectors are not used during Windows boot process instead two separate special partitions are needed:ĮFI System Partition(ESP) which holds boot related files (partition size 100-500 MB, formatted as FAT/FAT32).
How to move Windows 7 boot files to another drive/partition and make it bootable (procedure can be used also to make a bootable USB flash drive)
