diff --git a/diskfs.go b/diskfs.go
index f2e39cf2..3ab39ce5 100644
--- a/diskfs.go
+++ b/diskfs.go
@@ -158,8 +158,8 @@ func (m OpenModeOption) String() string {
 
 var openModeOptions = map[OpenModeOption]int{
 	ReadOnly:           os.O_RDONLY,
-	ReadWriteExclusive: os.O_RDWR | os.O_EXCL,
-	ReadWrite:          os.O_RDWR,
+	ReadWriteExclusive: os.O_RDWR | os.O_EXCL | os.O_SYNC,
+	ReadWrite:          os.O_RDWR | os.O_SYNC,
 }
 
 // SectorSize represents the sector size to use