diff --git a/src/vm.sh b/src/vm.sh
index 7768297..9802583 100755
--- a/src/vm.sh
+++ b/src/vm.sh
@@ -6,7 +6,8 @@
 # libvirt-daemon for /shrug
 SPICE_PORT=5930
 CHARDEV_ID='spicechannel0'
-# change drive if needed (default: /dev/sdb)
+DRIVE='/dev/sdb'    # change drive if needed
+ISO='win.iso'
 qemu-system-x86_64 \
     -enable-kvm \
     -daemonize \
@@ -16,8 +17,8 @@ qemu-system-x86_64 \
     -net user,hostname=windowsvm \
     -m 4G \
     -boot d \
-    -cdrom win.iso \
-    -drive file=/dev/sdb,cache=none,if=virtio \
+    -cdrom ${ISO} \
+    -drive file=${DRIVE},format=raw,cache=none,if=virtio \
     -vga qxl \
     -device virtio-serial-pci \
     -spice port=${SPICE_PORT},disable-ticketing=on \