diff --git a/run/install.sh b/run/install.sh
index 1356b3d..8d7eb5d 100644
--- a/run/install.sh
+++ b/run/install.sh
@@ -108,16 +108,24 @@ echo "Install: Creating partition table..."
 SYSTEM="$TMP/sys.img"
 SYSTEM_SIZE="4954537983"
 
-# Check free diskspace
-SPACE=$(df --output=avail -B 1 "$TMP" | tail -n 1)
+if [ "$ALLOCATE" != "Y" ]; then
 
-if (( SYSTEM_SIZE > SPACE )); then
-  echo "ERROR: Not enough free space to create virtual system disk." && exit 87
-fi
+  truncate -s "${SYSTEM_SIZE}" "${SYSTEM}"; 
+
+else
+
+  # Check free diskspace
+  SPACE=$(df --output=avail -B 1 "$TMP" | tail -n 1)
+
+  if (( SYSTEM_SIZE > SPACE )); then
+    echo "ERROR: Not enough free space to create a 4 GB system disk." && exit 87
+  fi
+
+  if ! fallocate -l "${SYSTEM_SIZE}" "${SYSTEM}"; then
+    rm -f "${SYSTEM}"
+    echo "ERROR: Could not allocate a file for the system disk." && exit 88
+  fi
 
-if ! fallocate -l "${SYSTEM_SIZE}" "${SYSTEM}"; then
-  rm -f "${SYSTEM}"
-  echo "ERROR: Could not allocate file for virtual system disk." && exit 88
 fi
 
 PART="$TMP/partition.fdisk"