diff --git a/bash/fs.sh b/bash/fs.sh
index df0980e..1b2e72b 100644
--- a/bash/fs.sh
+++ b/bash/fs.sh
@@ -17,3 +17,24 @@ fs_make_fat() {
 		mkfs.fat "${@}" "${device}"
 	fi
 }
+
+fs_wipe() {
+	local device="${1}"
+	local buffer="${2}"
+	local count="${3}"
+	if [ -b "${device}" ]; then
+		set -- \
+			status="progress" \
+			if="/dev/zero" \
+			of="${device}"
+		if [ -n "${buffer}" ]; then
+			set -- "${@}" \
+				bs="${buffer}"
+		fi
+		if [ -n "${count}" ]; then
+			set -- "${@}" \
+				count=${count}
+		fi
+		dd "${@}"
+	fi
+}