diff --git a/bootiso b/bootiso
index db60091..a0eedfd 100755
--- a/bootiso
+++ b/bootiso
@@ -510,7 +510,7 @@ initDevicesList() {
 	mapfile -t devices < <(lsblk -o NAME,TYPE | grep --color=never -oP '^\K\w+(?=\s+disk$)')
 	devicesList=()
 	for device in "${devices[@]}"; do
-		if [ "$(getDeviceType "/dev/$device")" == "usb" ] || [ "$disableUSBCheck" == 'true' ]; then
+		if [ "$(getDeviceType "/dev/$device")" == "usb" ] && [ "$(getDeviceTypewithExHDD "/dev/$device")" == "ID_DRIVE_THUMB=1" ] || [ "$disableUSBCheck" == 'true' ]; then
 			devicesList+=("$device")
 		fi
 	done
@@ -739,6 +739,12 @@ getDeviceType() {
 	echo "$deviceType"
 }
 
+getDeviceTypewithExHDD() {
+	typeset deviceName=/sys/block/${1#/dev/}
+	typeset getDeviceTypewithExHDD=$(udevadm info --query=property --path="$deviceName" | grep -o 'ID_DRIVE_THUMB=1')
+	echo "$getDeviceTypewithExHDD"
+}
+
 deviceIsDisk() {
 	lsblk --nodeps -o NAME,TYPE "$1" | grep -q disk
 	return $?