diff --git a/src/disk.sh b/src/disk.sh
index a4b6948..7fdf1c1 100644
--- a/src/disk.sh
+++ b/src/disk.sh
@@ -84,6 +84,7 @@ supportsDirect() {
 }
 
 createDisk() {
+
   local DISK_FILE=$1
   local DISK_SPACE=$2
   local DISK_DESC=$3
@@ -146,8 +147,8 @@ createDisk() {
     qcow2)
 
       local DISK_PARAM="$DISK_ALLOC"
-      isCow "$FS" && DISK_PARAM="$DISK_PARAM,nocow=on"
-      [ -n "$DISK_FLAGS" ] && DISK_PARAM="$DISK_PARAM,$DISK_FLAGS"
+      isCow "$FS" && DISK_PARAM+=",nocow=on"
+      [ -n "$DISK_FLAGS" ] && DISK_PARAM+=",$DISK_FLAGS"
 
       if ! qemu-img create -f "$DISK_FMT" -o "$DISK_PARAM" -- "$DISK_FILE" "$DATA_SIZE" ; then
         rm -f "$DISK_FILE"
@@ -167,6 +168,7 @@ createDisk() {
 }
 
 resizeDisk() {
+
   local DISK_FILE=$1
   local DISK_SPACE=$2
   local DISK_DESC=$3
@@ -232,6 +234,7 @@ resizeDisk() {
 }
 
 convertDisk() {
+
   local SOURCE_FILE=$1
   local SOURCE_FMT=$2
   local DST_FILE=$3
@@ -262,18 +265,19 @@ convertDisk() {
     fi
   fi
 
-  html "Converting $DISK_DESC to $DST_FMT..."
-  info "Converting $DISK_DESC to $DST_FMT, please wait until completed..."
+  local msg="Converting $DISK_DESC to $DST_FMT"
+  html "$msg..."
+  info "$msg, please wait until completed..."
 
   local CONV_FLAGS="-p"
   local DISK_PARAM="$DISK_ALLOC"
-  isCow "$FS" && DISK_PARAM="$DISK_PARAM,nocow=on"
+  isCow "$FS" && DISK_PARAM+=",nocow=on"
 
   if [[ "$DST_FMT" != "raw" ]]; then
       if [[ "$ALLOCATE" == [Nn]* ]]; then
-        CONV_FLAGS="$CONV_FLAGS -c"
+        CONV_FLAGS+=" -c"
       fi
-      [ -n "$DISK_FLAGS" ] && DISK_PARAM="$DISK_PARAM,$DISK_FLAGS"
+      [ -n "$DISK_FLAGS" ] && DISK_PARAM+=",$DISK_FLAGS"
   fi
 
   # shellcheck disable=SC2086
@@ -302,13 +306,15 @@ convertDisk() {
     fi
   fi
 
-  html "Conversion of $DISK_DESC completed..."
-  info "Conversion of $DISK_DESC to $DST_FMT completed succesfully!"
+  msg="Conversion of $DISK_DESC"
+  html "$msg completed..."
+  info "$msg to $DST_FMT completed succesfully!"
 
   return 0
 }
 
 checkFS () {
+
   local FS=$1
   local DISK_FILE=$2
   local DISK_DESC=$3
@@ -342,6 +348,7 @@ checkFS () {
 }
 
 createDevice () {
+
   local DISK_FILE=$1
   local DISK_TYPE=$2
   local DISK_INDEX=$3
@@ -360,22 +367,22 @@ createDevice () {
       echo "$result"
       ;;
     "usb" )
-      result="$result,if=none \
+      result+=",if=none \
       -device usb-storage,drive=${DISK_ID}${index}"
       echo "$result"
       ;;
     "ide" )
-      result="$result,if=none \
+      result+=",if=none \
       -device ide-hd,drive=${DISK_ID},bus=ide.$DISK_INDEX,rotation_rate=$DISK_ROTATION${index}"
       echo "$result"
       ;;
     "blk" | "virtio-blk" )
-      result="$result,if=none \
+      result+=",if=none \
       -device virtio-blk-pci,drive=${DISK_ID},scsi=off,bus=pcie.0,addr=$DISK_ADDRESS,iothread=io2${index}"
       echo "$result"
       ;;
     "scsi" | "virtio-scsi" )
-      result="$result,if=none \
+      result+=",if=none \
       -device virtio-scsi-pci,id=${DISK_ID}b,bus=pcie.0,addr=$DISK_ADDRESS,iothread=io2 \
       -device scsi-hd,drive=${DISK_ID},bus=${DISK_ID}b.0,channel=0,scsi-id=0,lun=0,rotation_rate=$DISK_ROTATION${index}"
       echo "$result"
@@ -386,6 +393,7 @@ createDevice () {
 }
 
 addMedia () {
+
   local DISK_FILE=$1
   local DISK_TYPE=$2
   local DISK_BUS=$3
@@ -402,22 +410,22 @@ addMedia () {
       echo "$result"
       ;;
     "usb" )
-      result="$result,if=none \
+      result+=",if=none \
       -device usb-storage,drive=${DISK_ID}${index},removable=on"
       echo "$result"
       ;;
     "ide" )
-      result="$result,if=none \
+      result+=",if=none \
       -device ide-cd,drive=${DISK_ID},bus=ide.${DISK_BUS}${index}"
       echo "$result"
       ;;
     "blk" | "virtio-blk" )
-      result="$result,if=none \
+      result+=",if=none \
       -device virtio-blk-pci,drive=${DISK_ID},scsi=off,bus=pcie.0,addr=$DISK_ADDRESS,iothread=io2${index}"
       echo "$result"
       ;;
     "scsi" | "virtio-scsi" )
-      result="$result,if=none \
+      result+=",if=none \
       -device virtio-scsi-pci,id=${DISK_ID}b,bus=pcie.0,addr=$DISK_ADDRESS,iothread=io2 \
       -device scsi-cd,drive=${DISK_ID},bus=${DISK_ID}b.0${index}"
       echo "$result"
@@ -428,6 +436,7 @@ addMedia () {
 }
 
 addDisk () {
+
   local DISK_BASE=$1
   local DISK_TYPE=$2
   local DISK_DESC=$3
@@ -468,6 +477,7 @@ addDisk () {
     else
       PREV_FMT="qcow2"
     fi
+
     PREV_EXT=$(fmt2ext "$PREV_FMT")
 
     if [ -s "$DISK_BASE.$PREV_EXT" ] ; then
@@ -490,12 +500,13 @@ addDisk () {
   fi
 
   OPTS=$(createDevice "$DISK_FILE" "$DISK_TYPE" "$DISK_INDEX" "$DISK_ADDRESS" "$DISK_FMT" "$DISK_IO" "$DISK_CACHE")
-  DISK_OPTS="$DISK_OPTS $OPTS"
+  DISK_OPTS+=" $OPTS"
 
   return 0
 }
 
 addDevice () {
+
   local DISK_DEV=$1
   local DISK_TYPE=$2
   local DISK_INDEX=$3
@@ -506,31 +517,34 @@ addDevice () {
 
   local OPTS
   OPTS=$(createDevice "$DISK_DEV" "$DISK_TYPE" "$DISK_INDEX" "$DISK_ADDRESS" "raw" "$DISK_IO" "$DISK_CACHE")
-  DISK_OPTS="$DISK_OPTS $OPTS"
+  DISK_OPTS+=" $OPTS"
 
   return 0
 }
 
-DISK_OPTS=""
 html "Initializing disks..."
 
+[ -z "${DISK_OPTS:-}" ] && DISK_OPTS=""
+[ -z "${DISK_TYPE:-}" ] && DISK_TYPE="scsi"
+
 case "${DISK_TYPE,,}" in
-  "blk" ) MEDIA_TYPE="auto" ;;
-  "" ) DISK_TYPE="scsi" && MEDIA_TYPE="$DISK_TYPE" ;;
-  "auto" | "ide" | "usb" | "scsi" ) MEDIA_TYPE="$DISK_TYPE" ;;
+  "ide" | "usb" | "scsi" | "blk" | "auto" ) ;;
   * ) error "Invalid DISK_TYPE, value \"$DISK_TYPE\" is unrecognized!" && exit 80 ;;
 esac
 
+[[ "${MACHINE,,}" != "virt" ]] && MEDIA_TYPE="ide" || MEDIA_TYPE="auto"
+
 if [ -f "$BOOT" ] && [ -s "$BOOT" ]; then
-  DISK_OPTS=$(addMedia "$BOOT" "$MEDIA_TYPE" "0" "$BOOT_INDEX" "0x5")
+  ADD_OPTS=$(addMedia "$BOOT" "$MEDIA_TYPE" "0" "$BOOT_INDEX" "0x5")
+  DISK_OPTS+=" $ADD_OPTS"
 fi
 
 DRIVERS="/drivers.iso"
 [ ! -f "$DRIVERS" ] || [ ! -s "$DRIVERS" ] && DRIVERS="$STORAGE/drivers.iso"
 
 if [ -f "$DRIVERS" ] && [ -s "$DRIVERS" ]; then
-  DRIVER_OPTS=$(addMedia "$DRIVERS" "auto" "1" "" "0x6")
-  DISK_OPTS="$DISK_OPTS $DRIVER_OPTS"
+  ADD_OPTS=$(addMedia "$DRIVERS" "$MEDIA_TYPE" "1" "" "0x6")
+  DISK_OPTS+=" $ADD_OPTS"
 fi
 
 DISK1_FILE="$STORAGE/data"
@@ -602,7 +616,7 @@ else
   addDisk "$DISK4_FILE" "$DISK_TYPE" "disk4" "$DISK4_SIZE" "6" "0xd" "$DISK_FMT" "$DISK_IO" "$DISK_CACHE" || exit $?
 fi
 
-DISK_OPTS="$DISK_OPTS -object iothread,id=io2"
+DISK_OPTS+=" -object iothread,id=io2"
 
 html "Initialized disks successfully..."