diff --git a/unmaintained/change_superblock/change_superblock.go b/unmaintained/change_superblock/change_superblock.go
index 754b0b5e2..04db7cfc1 100644
--- a/unmaintained/change_superblock/change_superblock.go
+++ b/unmaintained/change_superblock/change_superblock.go
@@ -48,7 +48,7 @@ func main() {
 	if err != nil {
 		glog.Fatalf("Open Volume Data File [ERROR]: %v", err)
 	}
-	datBackend := backend.NewDiskFile(*fixVolumePath, datFile)
+	datBackend := backend.NewDiskFile(datFile)
 	defer datBackend.Close()
 
 	superBlock, err := storage.ReadSuperBlock(datBackend)
diff --git a/unmaintained/fix_dat/fix_dat.go b/unmaintained/fix_dat/fix_dat.go
index 1ad560a7d..e88a48c96 100644
--- a/unmaintained/fix_dat/fix_dat.go
+++ b/unmaintained/fix_dat/fix_dat.go
@@ -50,7 +50,7 @@ func main() {
 	if err != nil {
 		glog.Fatalf("Read Volume Data %v", err)
 	}
-	datBackend := backend.NewDiskFile(datFileName, datFile)
+	datBackend := backend.NewDiskFile(datFile)
 	defer datBackend.Close()
 
 	newDatFile, err := os.Create(path.Join(*fixVolumePath, fileName+".dat_fixed"))
diff --git a/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go b/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
index 5eeb7e1c8..d44bc5354 100644
--- a/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
+++ b/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
@@ -50,7 +50,7 @@ func (scanner *VolumeFileScanner4SeeDat) VisitNeedle(n *needle.Needle, offset in
 		if err != nil {
 			glog.Fatalf("Write New Volume Data %v", err)
 		}
-		scanner.datBackend = backend.NewDiskFile(newFileName, newDatFile)
+		scanner.datBackend = backend.NewDiskFile(newDatFile)
 		scanner.datBackend.WriteAt(scanner.block.Bytes(), 0)
 	}
 
diff --git a/weed/storage/backend/disk_file.go b/weed/storage/backend/disk_file.go
index 7c8616cf6..7f2b39d15 100644
--- a/weed/storage/backend/disk_file.go
+++ b/weed/storage/backend/disk_file.go
@@ -14,9 +14,9 @@ type DiskFile struct {
 	fullFilePath string
 }
 
-func NewDiskFile(fullFilePath string, f *os.File) *DiskFile {
+func NewDiskFile(f *os.File) *DiskFile {
 	return &DiskFile{
-		fullFilePath: fullFilePath,
+		fullFilePath: f.Name(),
 		File:         f,
 	}
 }
diff --git a/weed/storage/needle/needle_read_write_test.go b/weed/storage/needle/needle_read_write_test.go
index 7b05d5d10..47582dd26 100644
--- a/weed/storage/needle/needle_read_write_test.go
+++ b/weed/storage/needle/needle_read_write_test.go
@@ -55,7 +55,7 @@ func TestAppend(t *testing.T) {
 		os.Remove(tempFile.Name())
 	}()
 
-	datBackend := backend.NewDiskFile(tempFile.Name(), tempFile)
+	datBackend := backend.NewDiskFile(tempFile)
 	defer datBackend.Close()
 
 	offset, _, _, _ := n.Append(datBackend, CurrentVersion)
diff --git a/weed/storage/volume_loading.go b/weed/storage/volume_loading.go
index 41cd017cb..e769321c4 100644
--- a/weed/storage/volume_loading.go
+++ b/weed/storage/volume_loading.go
@@ -50,7 +50,7 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 			return fmt.Errorf("Volume Data file %s.dat does not exist.", fileName)
 		}
 	}
-	v.DataBackend = backend.NewDiskFile(fileName+".dat", dataFile)
+	v.DataBackend = backend.NewDiskFile(dataFile)
 
 	if e != nil {
 		if !os.IsPermission(e) {
diff --git a/weed/storage/volume_super_block.go b/weed/storage/volume_super_block.go
index fe357a988..6faf34ef3 100644
--- a/weed/storage/volume_super_block.go
+++ b/weed/storage/volume_super_block.go
@@ -98,7 +98,7 @@ func (v *Volume) maybeWriteSuperBlock() error {
 				//read-only, but zero length - recreate it!
 				var dataFile *os.File
 				if dataFile, e = os.Create(v.DataBackend.String()); e == nil {
-					v.DataBackend = backend.NewDiskFile(v.DataBackend.String(), dataFile)
+					v.DataBackend = backend.NewDiskFile(dataFile)
 					if _, e = v.DataBackend.WriteAt(v.SuperBlock.Bytes(), 0); e == nil {
 						v.readOnly = false
 					}
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index bf83c4372..9619c9fa3 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -147,7 +147,7 @@ func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldI
 	defer oldIdxFile.Close()
 
 	oldDatFile, err := os.Open(oldDatFileName)
-	oldDatBackend := backend.NewDiskFile(oldDatFileName, oldDatFile)
+	oldDatBackend := backend.NewDiskFile(oldDatFile)
 	defer oldDatBackend.Close()
 
 	if indexSize, err = verifyIndexFileIntegrity(oldIdxFile); err != nil {
@@ -198,7 +198,7 @@ func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldI
 	if dst, err = os.OpenFile(newDatFileName, os.O_RDWR, 0644); err != nil {
 		return fmt.Errorf("open dat file %s failed: %v", newDatFileName, err)
 	}
-	dstDatBackend := backend.NewDiskFile(newDatFileName, dst)
+	dstDatBackend := backend.NewDiskFile(dst)
 	defer dstDatBackend.Close()
 
 	if idx, err = os.OpenFile(newIdxFileName, os.O_RDWR, 0644); err != nil {
@@ -328,7 +328,7 @@ func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string, prealloca
 		v:              v,
 		now:            uint64(time.Now().Unix()),
 		nm:             NewBtreeNeedleMap(idx),
-		dstBackend:     backend.NewDiskFile(dstName, dst),
+		dstBackend:     backend.NewDiskFile(dst),
 		writeThrottler: util.NewWriteThrottler(compactionBytePerSecond),
 	}
 	err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind, scanner)
@@ -342,7 +342,7 @@ func (v *Volume) copyDataBasedOnIndexFile(dstName, idxName string) (err error) {
 	if dst, err = os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
 		return
 	}
-	dstDatBackend := backend.NewDiskFile(dstName, dst)
+	dstDatBackend := backend.NewDiskFile(dst)
 	defer dstDatBackend.Close()
 
 	if idx, err = os.OpenFile(idxName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {