Windows iso to USB

winiso2usb.sh

#!/usr/bin/env bash
set -euo pipefail

# Usage:
#   ./makewin11.sh                 list external disks, then exit
#   ./makewin11.sh <disk> <iso>    build the USB
#     <disk>  e.g. /dev/disk4   (see the list above)
#     <iso>   path to the Windows 11 ISO

list_disks() {
  echo "External / removable disks:"
  echo
  # Show only external, physical disks with their size and identifier
  diskutil list external physical 2>/dev/null || diskutil list
  echo
  echo "Pick the whole-disk identifier (e.g. /dev/disk4) that matches your USB by SIZE."
  echo "Then run: $0 /dev/diskN /path/to/Win11.iso"
}

# No args (or explicit list flag): show disks and exit
if [ "$#" -eq 0 ] || [ "${1:-}" = "list" ] || [ "${1:-}" = "-l" ]; then
  list_disks
  exit 0
fi

if [ "$#" -ne 2 ]; then
  echo "Usage: $0 <disk> <iso>   (run with no args to list disks)" >&2
  exit 1
fi

DISK="$1"
ISO="$2"

# Validate the disk: must exist AND be external (guards against wiping an internal drive)
if [ ! -e "$DISK" ]; then
  echo "Error: disk '$DISK' not found. Run '$0' with no args to list disks." >&2
  exit 1
fi
if ! diskutil info "$DISK" 2>/dev/null | grep -qiE 'Device Location: *External|Internal: *No'; then
  echo "Error: '$DISK' does not look like an external disk. Refusing to continue." >&2
  echo "Run '$0' with no args to see external disks." >&2
  exit 1
fi
if [ ! -f "$ISO" ]; then
  echo "Error: ISO '$ISO' not found." >&2
  exit 1
fi

# Final confirmation before destroying data
echo "About to ERASE this disk:"
diskutil info "$DISK" | grep -iE 'Device Identifier|Media Name|Disk Size'
echo
read -r -p "Type ERASE to continue: " confirm
[ "$confirm" = "ERASE" ] || { echo "Aborted."; exit 1; }

TMP="$HOME/wim_temp"
USB="/Volumes/WINUSB"

# 1. Wipe + format FAT32 / MBR
diskutil unmountDisk force "$DISK" 2>/dev/null || true
diskutil eraseDisk MS-DOS "WINUSB" MBR "$DISK"

# 2. Mount ISO, capture mount point
MNT=$(hdiutil attach "$ISO" -nobrowse | grep -o '/Volumes/.*' | head -1)
echo "ISO mounted at: $MNT"

# 3. Copy everything except oversized install.wim
rsync -avh --progress --exclude=sources/install.wim "$MNT/" "$USB/"

# 4. Split install.wim on internal SSD first
rm -rf "$TMP"; mkdir -p "$TMP"
wimlib-imagex split "$MNT/sources/install.wim" "$TMP/install.swm" 3800

# 5. Copy split pieces onto the stick
rsync -avh --progress "$TMP"/install*.swm "$USB/sources/"

# 6. Verify: no file over 4GB (should print nothing)
echo "-- files over 4GB (should be empty): --"
find "$USB" \( -name .Spotlight-V100 -o -name .fseventsd \) -prune -o -type f -size +4000000k -print 2>/dev/null

# 7. Verify boot file present
ls -la "$USB/efi/boot/bootx64.efi"

# 8. Cleanup + eject
hdiutil detach "$MNT"
rm -rf "$TMP"
diskutil eject "$DISK"

echo "Done."