diff --git a/scripts/win-ci/run-vm.sh b/scripts/win-ci/run-vm.sh
index 4fc6cf6..9ffff58 100755
--- a/scripts/win-ci/run-vm.sh
+++ b/scripts/win-ci/run-vm.sh
@@ -18,6 +18,24 @@ fi
 
 rm -f "$D/qmp.sock"
 
+# 설치가 끝나면 Windows ISO(4.8GB)는 필요 없어서 지운다. 그래도 유닛이 뜨도록
+# 없는 ISO 는 그냥 건너뛴다. 없는 파일을 -drive 로 주면 qemu 가 기동에 실패해
+# 재부팅 후 러너 호스트가 조용히 사라진다.
+CDROMS=()
+add_cd() {  # 파일 버스 [bootindex]
+  [ -f "$1" ] || { echo "cdrom 건너뜀 (없음): $1" >&2; return; }
+  local id="cd$(basename "$1" | tr -cd 'a-z0-9')"
+  CDROMS+=( -drive "file=$1,if=none,id=$id,media=cdrom,readonly=on" )
+  if [ -n "${3:-}" ]; then
+    CDROMS+=( -device "ide-cd,drive=$id,bus=$2,bootindex=$3" )
+  else
+    CDROMS+=( -device "ide-cd,drive=$id,bus=$2" )
+  fi
+}
+add_cd "$D/iso/win11-ltsc.iso" ide.1 1
+add_cd "$D/iso/virtio-win.iso" ide.2
+add_cd "$D/unattend.iso"       ide.3
+
 exec qemu-system-x86_64 \
   -name win-ci,process=win-ci \
   -machine q35,smm=on,vmport=off \
@@ -43,12 +61,7 @@ exec qemu-system-x86_64 \
   -device usb-kbd -device usb-tablet \
   -drive "file=$D/win-ci.qcow2,if=none,id=sysdisk,format=qcow2,cache=writeback,discard=unmap,aio=threads" \
   -device ide-hd,drive=sysdisk,bus=ide.0,bootindex=2 \
-  -drive "file=$D/iso/win11-ltsc.iso,if=none,id=cdwin,media=cdrom,readonly=on" \
-  -device ide-cd,drive=cdwin,bus=ide.1,bootindex=1 \
-  -drive "file=$D/iso/virtio-win.iso,if=none,id=cdvirtio,media=cdrom,readonly=on" \
-  -device ide-cd,drive=cdvirtio,bus=ide.2 \
-  -drive "file=$D/unattend.iso,if=none,id=cdunattend,media=cdrom,readonly=on" \
-  -device ide-cd,drive=cdunattend,bus=ide.3 \
+  "${CDROMS[@]}" \
   -serial "file:$D/serial.log" \
   -qmp "unix:$D/qmp.sock,server=on,wait=off" \
   -vnc 127.0.0.1:19 \