diff --git a/run/disk.sh b/run/disk.sh
index 8a0a146..129b620 100644
--- a/run/disk.sh
+++ b/run/disk.sh
@@ -1,6 +1,12 @@
 #!/usr/bin/env bash
 set -eu
 
+# Docker environment variabeles
+
+: ${DISK_IO:='native'}          # I/O Mode, can be set to 'native', 'threads' or 'io_turing' 
+: ${DISK_ROTATION:='1'}    # Rotation rate, set to 1 for SSD storage and increase for HDD
+: ${DISK_CACHE:='none'}   # Caching mode, can be set to 'writeback' for better performance
+
 BOOT="$STORAGE/boot.img"
 [ ! -f "$BOOT" ] && echo "ERROR: Boot image does not exist ($BOOT)" && exit 81
 
@@ -15,20 +21,36 @@ if [ -f "${DATA}" ]; then
   if [ "$DATA_SIZE" -gt "$OLD_SIZE" ]; then
 
     echo "INFO: Resizing data disk from $OLD_SIZE to $DATA_SIZE bytes.."
-           
-    REQ=$((DATA_SIZE-OLD_SIZE))
-      
-    # Check free diskspace    
-    SPACE=$(df --output=avail -B 1 "${STORAGE}" | tail -n 1)
-      
-    if (( REQ > SPACE )); then
-      echo "ERROR: Not enough free space to resize virtual disk." && exit 84
-    fi
 
-    if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
-      echo "ERROR: Could not allocate file for virtual disk." && exit 85
+    if [ "$ALLOCATE" = "N" ]; then
+
+      truncate -s "${DATA_SIZE}" "${DATA}"; 
+
+    else
+
+      REQ=$((DATA_SIZE-OLD_SIZE))
+
+      # Check free diskspace    
+      SPACE=$(df --output=avail -B 1 "${STORAGE}" | tail -n 1)
+
+      if (( REQ > SPACE )); then
+        echo "ERROR: Not enough free space to resize data disk to ${DISK_SIZE}."
+        echo "ERROR: Specify a smaller size or disable preallocation with ALLOCATE=N." && exit 84
+      fi
+
+      if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
+        echo "ERROR: Could not allocate a file for the data disk." && exit 85
+      fi
+
+      if [ "$ALLOCATE" = "Z" ]; then
+
+        GB=$(( (REQ + 1073741823)/1073741824 ))
+
+        echo "INFO: Preallocating ${GB} GB of diskspace, please wait..."
+        dd if=/dev/urandom of="${DATA}" seek="${OLD_SIZE}" count="${REQ}" bs=1M iflag=count_bytes oflag=seek_bytes status=none
+
+      fi
     fi
-      
   fi
 
   if [ "$DATA_SIZE" -lt "$OLD_SIZE" ]; then
@@ -39,35 +61,57 @@ if [ -f "${DATA}" ]; then
     mv -f "${DATA}" "${DATA}.bak"
 
   fi
-  
 fi
 
 if [ ! -f "${DATA}" ]; then
 
-  # Check free diskspace
-  SPACE=$(df --output=avail -B 1 "${STORAGE}" | tail -n 1)
-
-  if (( DATA_SIZE > SPACE )); then
-    echo "ERROR: Not enough free space to create virtual disk." && exit 86
-  fi
-
   # Create an empty file
-  if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
-    rm -f "${DATA}"
-    echo "ERROR: Could not allocate file for virtual disk." && exit 87
+
+  if [ "$ALLOCATE" = "N" ]; then
+
+    truncate -s "${DATA_SIZE}" "${DATA}"
+
+  else
+
+    # Check free diskspace
+    SPACE=$(df --output=avail -B 1 "${STORAGE}" | tail -n 1)
+
+    if (( DATA_SIZE > SPACE )); then
+      echo "ERROR: Not enough free space to create a data disk of ${DISK_SIZE}."
+      echo "ERROR: Specify a smaller size or disable preallocation with ALLOCATE=N." && exit 86
+    fi
+
+    if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
+      rm -f "${DATA}"
+      echo "ERROR: Could not allocate a file for the data disk." && exit 87
+    fi
+
+    if [ "$ALLOCATE" = "Z" ]; then
+
+      echo "INFO: Preallocating ${DISK_SIZE} of diskspace, please wait..."
+      dd if=/dev/urandom of="${DATA}" count="${DATA_SIZE}" bs=1M iflag=count_bytes status=none
+
+    fi
   fi
 
   # Check if file exists
   if [ ! -f "${DATA}" ]; then
-    echo "ERROR: Data image does not exist ($DATA)" && exit 88
+    echo "ERROR: Data disk does not exist ($DATA)" && exit 88
   fi
 
 fi
 
-KVM_DISK_OPTS="\
+# Check the filesize
+SIZE=$(stat -c%s "${DATA}")
+
+if [[ SIZE -ne DATA_SIZE ]]; then
+  echo "ERROR: Data disk has the wrong size: ${SIZE}" && exit 89
+fi
+
+DISK_OPTS="\
     -drive id=cdrom0,if=none,format=raw,readonly=on,file=${BOOT} \
     -device virtio-scsi-pci,id=scsi0 \
     -device scsi-cd,bus=scsi0.0,drive=cdrom0 \
     -device virtio-scsi-pci,id=hw-userdata,bus=pcie.0,addr=0xa \
-    -drive file=${DATA},if=none,id=drive-userdata,format=raw,cache=none,aio=native,discard=on,detect-zeroes=on \
-    -device scsi-hd,bus=hw-userdata.0,channel=0,scsi-id=0,lun=0,drive=drive-userdata,id=userdata0,rotation_rate=1,bootindex=1"
+    -drive file=${DATA},if=none,id=drive-userdata,format=raw,cache=${DISK_CACHE},aio=${DISK_IO},discard=on,detect-zeroes=on \
+    -device scsi-hd,bus=hw-userdata.0,channel=0,scsi-id=0,lun=0,drive=drive-userdata,id=userdata0,rotation_rate=${DISK_ROTATION},bootindex=1"