diff --git a/source/fileop.h b/source/fileop.h
index a1a48cd..63f6c3b 100644
--- a/source/fileop.h
+++ b/source/fileop.h
@@ -18,7 +18,7 @@
 #include <fat.h>
 #include <unistd.h>
 
-#define SAVEBUFFERSIZE (1024 * 1024 * 2)
+#define SAVEBUFFERSIZE (1024 * 512)
 
 void InitDeviceThread();
 void ResumeDeviceThread();