diff --git a/files/board/arpl/overlayfs/opt/arpl/boot.sh b/files/board/arpl/overlayfs/opt/arpl/boot.sh
index 812f4025..b04f66d8 100755
--- a/files/board/arpl/overlayfs/opt/arpl/boot.sh
+++ b/files/board/arpl/overlayfs/opt/arpl/boot.sh
@@ -74,14 +74,16 @@ EFI_BUG="`readModelKey "${MODEL}" "builds.${BUILD}.efi-bug"`"
 
 LOADER_DISK="`blkid | grep 'LABEL="ARPL3"' | cut -d3 -f1`"
 BUS=`udevadm info --query property --name ${LOADER_DISK} | grep ID_BUS | cut -d= -f2`
-
-# Read SATADoM type
-DOM="`readModelKey "${MODEL}" "dom"`"
+if [ "${BUS}" = "ata" ]; then
+  SIZE=$((`df -BM | awk '/\/mnt\/p3/{print$2}' | tr 'M' ' '`+300))
+  # Read SATADoM type
+  DOM="`readModelKey "${MODEL}" "dom"`"
+fi
 
 # Prepare command line
 CMDLINE_LINE=""
 [ ${EFI} -eq 1 ] && CMDLINE_LINE+="withefi "
-[ "${BUS}" = "ata" ] && CMDLINE_LINE+="synoboot_satadom=${DOM} "
+[ "${BUS}" = "ata" ] && CMDLINE_LINE+="synoboot_satadom=${DOM} dom_szmax=${SIZE} "
 CMDLINE_LINE+="console=ttyS0,115200n8 earlyprintk log_buf_len=32M earlycon=uart8250,io,0x3f8,115200n8 elevator=elevator root=/dev/md0 loglevel=15"
 for KEY in ${!CMDLINE[@]}; do
   VALUE="${CMDLINE[${KEY}]}"