Test writable without writing a file. This reduces the chance of corruption: merely mounting a device should not write to it.

stepmania/src/arch/MemoryCard/MemoryCardDriverThreaded_Linux.cpp

@@ -40,15 +40,7 @@ bool VectorsAreEqual( const T &a, const T &b )
 
 static bool TestWrite( CCStringRef sDir )
 {
-	// Try to write a file.
+	return access(sDir, W_OK) == 0;
-	// TODO: Can we use RageFile for this?
-	CString sFile = sDir + "/temp";
-	FILE* fp = fopen( sFile, "w" );
-	if( fp == NULL )
-		return false;
-	fclose( fp );
-	remove( sFile );
-	return true;
 }
 
 static bool ExecuteCommand( CCStringRef sCommand )