Mainly you need to get away with dd if=/dev/hdx of=/dev/hdy (dd) executed in macOS Restoration’s Terminal, the place if is supply and of is vacation spot. Do not by chance swap IF with OF or you’ll erase contents of your supply drive. This can copy device-to-device by 512-byte blocks maintaining your partition map (together with EFI contents required in addition Home windows). This is a brief quote of a good write-up on the way it works with screenshots and instance that matches your want completely:
dd (disk duplication) is a Mac OS X command-line utility which may
learn uncooked information off a disk, even when the Mac would not perceive the
filesystem. There’s additionally a freeware model of dd for Home windows
obtainable, with directions.
P.S. Home windows may not boot after disk has modified (cloned to). This must be attainable to repair this manner. Boot to supply Home windows drive, connect vacation spot drive with cloned partitions, mount EFI quantity of vacation spot drive to letter V: (Command Immediate > diskpart > record disk > choose disk 2 (2 is your vacation spot drive, double-check this) > record partition > choose partition 1 (1 is EFI partition on vacation spot drive, must be 200 MB) > assign letter v: > exit or Win+R > diskmgmt.msc > right-click EFI on exterior drive > Assign letter), execute Command Immediate command BCDBOOT Z:Home windows /S V: /F ALL (bcdboot, maybe you can use BIOS or UEFI as a substitute of ALL however I do not know kind of your set up) the place Z: is your exterior drive’s Home windows partition. Please be aware that you need to observe disk quantity, partition and letters by your individual, it is simply an instance. After that Home windows partition on newly cloned disk ought to change into bootable once more. As soon as once more, it perhaps good to go with out this additional step of re-writing boot sector.
P.P.S. In the event you’re unsure what you are doing you may additionally attempt utilizing Clonezilla, here is a video instance.