4 files changed, 26 insertions, 0 deletions
diff --git a/src/lib/cross.h b/src/lib/cross.h
index 114581269..d8296e217 100644
--- a/src/lib/cross.h
+++ b/src/lib/cross.h
@@ -117,6 +117,8 @@ public:
 		return _device;
 	}
 
+	std::string device_for_write () const;
+
 	bool mounted () const {
 		return !_mount_points.empty();
 	}
diff --git a/src/lib/cross_linux.cc b/src/lib/cross_linux.cc
index 36683a0cd..983dbb669 100644
--- a/src/lib/cross_linux.cc
+++ b/src/lib/cross_linux.cc
@@ -344,6 +344,13 @@ Drive::unmount ()
 }
 
 
+string
+Drive::device_for_write () const
+{
+	return device ();
+}
+
+
 void
 unprivileged ()
 {
diff --git a/src/lib/cross_osx.cc b/src/lib/cross_osx.cc
index 6e8ef168c..66be376d4 100644
--- a/src/lib/cross_osx.cc
+++ b/src/lib/cross_osx.cc
@@ -493,6 +493,16 @@ Drive::get ()
 	return drives;
 }
 
+
+string
+Drive::device_for_write () const
+{
+	string w = _device;
+	boost::replace_all (w, "/dev/disk", "/dev/rdisk");
+	return w;
+}
+
+
 boost::filesystem::path
 config_path ()
 {
diff --git a/src/lib/cross_windows.cc b/src/lib/cross_windows.cc
index 8ccc790d6..96c69d780 100644
--- a/src/lib/cross_windows.cc
+++ b/src/lib/cross_windows.cc
@@ -596,6 +596,13 @@ Drive::unmount ()
 }
 
 
+string
+Drive::device_for_write () const
+{
+	return device ();
+}
+
+
 boost::filesystem::path
 config_path ()
 {