diff --git a/weed-fs/src/cmd/weed/fix.go b/weed-fs/src/cmd/weed/fix.go
index 7a186f44f..7bed70edd 100644
--- a/weed-fs/src/cmd/weed/fix.go
+++ b/weed-fs/src/cmd/weed/fix.go
@@ -52,7 +52,7 @@ func runFix(cmd *Command, args []string) bool {
 
 	ver, _, _ := storage.ParseSuperBlock(header)
 
-	n, rest := storage.ReadNeedle(dataFile, ver)
+	n, rest := storage.ReadNeedleHeader(dataFile, ver)
 	dataFile.Seek(int64(rest), 1)
 	nm := storage.NewNeedleMap(indexFile)
 	offset := uint32(storage.SuperBlockSize)
@@ -63,7 +63,7 @@ func runFix(cmd *Command, args []string) bool {
 			debug("saved", count, "with error", pe)
 		}
 		offset += rest + 16
-		n, rest = storage.ReadNeedle(dataFile, ver)
+		n, rest = storage.ReadNeedleHeader(dataFile, ver)
 		dataFile.Seek(int64(rest), 1)
 	}
 	return true
diff --git a/weed-fs/src/pkg/storage/needle.go b/weed-fs/src/pkg/storage/needle.go
index ffa9beb06..0363fcb13 100644
--- a/weed-fs/src/pkg/storage/needle.go
+++ b/weed-fs/src/pkg/storage/needle.go
@@ -11,16 +11,22 @@ import (
 	"strings"
 )
 
+const (
+	NeedleHeaderSize  = 16 //should never change this
+	NeedlePaddingSize = 8
+)
+
 type Needle struct {
-	Cookie uint32 "random number to mitigate brute force lookups"
-	Id     uint64 "needle id"
-	Size   uint32 "sum of DataSize,Data,NameSize,Name,MimeSize,Mime"
-	//	DataSize uint32 "Data size"
-	Data []byte "The actual file data"
-	//	NameSize uint16
-	//	Name     []byte "maximum 256 characters"
-	//	MimeSize uint16
-	//	Mime     []byte "maximum 256 characters"
+	Cookie   uint32 "random number to mitigate brute force lookups"
+	Id       uint64 "needle id"
+	Size     uint32 "sum of DataSize,Data,NameSize,Name,MimeSize,Mime"
+	Flags    byte   "boolean flags" //version2
+	DataSize uint32 "Data size"     //version2
+	Data     []byte "The actual file data"
+	NameSize uint8  //version2
+	Name     []byte "maximum 256 characters" //version2
+	MimeSize uint8  //version2
+	Mime     []byte "maximum 256 characters" //version2
 	Checksum CRC    "CRC32 to check integrity"
 	Padding  []byte "Aligned to 8 bytes"
 }
@@ -87,13 +93,13 @@ func (n *Needle) ParsePath(fid string) {
 	}
 }
 func ParseKeyHash(key_hash_string string) (uint64, uint32) {
-    key_hash_bytes, khe := hex.DecodeString(key_hash_string)
-    key_hash_len := len(key_hash_bytes)
-    if khe != nil || key_hash_len <= 4 {
-        println("Invalid key_hash", key_hash_string, "length:", key_hash_len, "error", khe)
-        return 0, 0
-    }
-    key := util.BytesToUint64(key_hash_bytes[0 : key_hash_len-4])
-    hash := util.BytesToUint32(key_hash_bytes[key_hash_len-4 : key_hash_len])
-    return key, hash
+	key_hash_bytes, khe := hex.DecodeString(key_hash_string)
+	key_hash_len := len(key_hash_bytes)
+	if khe != nil || key_hash_len <= 4 {
+		println("Invalid key_hash", key_hash_string, "length:", key_hash_len, "error", khe)
+		return 0, 0
+	}
+	key := util.BytesToUint64(key_hash_bytes[0 : key_hash_len-4])
+	hash := util.BytesToUint32(key_hash_bytes[key_hash_len-4 : key_hash_len])
+	return key, hash
 }
diff --git a/weed-fs/src/pkg/storage/needle_read_write.go b/weed-fs/src/pkg/storage/needle_read_write.go
index 482323701..72096edf7 100644
--- a/weed-fs/src/pkg/storage/needle_read_write.go
+++ b/weed-fs/src/pkg/storage/needle_read_write.go
@@ -7,22 +7,25 @@ import (
 	"pkg/util"
 )
 
-func (n *Needle) Append(w io.Writer) uint32 {
-	header := make([]byte, 16)
-	util.Uint32toBytes(header[0:4], n.Cookie)
-	util.Uint64toBytes(header[4:12], n.Id)
-	n.Size = uint32(len(n.Data))
-	util.Uint32toBytes(header[12:16], n.Size)
-	w.Write(header)
-	w.Write(n.Data)
-	rest := 8 - ((16 + n.Size + 4) % 8)
-	util.Uint32toBytes(header[0:4], n.Checksum.Value())
-	w.Write(header[0 : 4+rest])
+func (n *Needle) Append(w io.Writer, version Version) uint32 {
+	if version == Version1 {
+		header := make([]byte, NeedleHeaderSize)
+		util.Uint32toBytes(header[0:4], n.Cookie)
+		util.Uint64toBytes(header[4:12], n.Id)
+		n.Size = uint32(len(n.Data))
+		util.Uint32toBytes(header[12:16], n.Size)
+		w.Write(header)
+		w.Write(n.Data)
+		rest := NeedlePaddingSize - ((NeedleHeaderSize + n.Size + 4) % NeedlePaddingSize)
+		util.Uint32toBytes(header[0:4], n.Checksum.Value())
+		w.Write(header[0 : 4+rest])
+	} else if version == Version2 {
+	}
 	return n.Size
 }
 func (n *Needle) Read(r io.Reader, size uint32, version Version) (int, error) {
 	if version == Version1 {
-		bytes := make([]byte, 16+size+4)
+		bytes := make([]byte, NeedleHeaderSize+size+4)
 		ret, e := r.Read(bytes)
 		n.Cookie = util.BytesToUint32(bytes[0:4])
 		n.Id = util.BytesToUint64(bytes[4:12])
@@ -37,10 +40,10 @@ func (n *Needle) Read(r io.Reader, size uint32, version Version) (int, error) {
 	}
 	return 0, errors.New("Unsupported Version!")
 }
-func ReadNeedle(r *os.File, version Version) (n *Needle, bytesTillNextFile uint32) {
+func ReadNeedleHeader(r *os.File, version Version) (n *Needle, bodyLength uint32) {
 	n = new(Needle)
 	if version == Version1 {
-		bytes := make([]byte, 16)
+		bytes := make([]byte, NeedleHeaderSize)
 		count, e := r.Read(bytes)
 		if count <= 0 || e != nil {
 			return nil, 0
@@ -48,8 +51,21 @@ func ReadNeedle(r *os.File, version Version) (n *Needle, bytesTillNextFile uint3
 		n.Cookie = util.BytesToUint32(bytes[0:4])
 		n.Id = util.BytesToUint64(bytes[4:12])
 		n.Size = util.BytesToUint32(bytes[12:16])
-		rest := 8 - ((n.Size + 16 + 4) % 8)
-		bytesTillNextFile = n.Size + 4 + rest
+		rest := NeedlePaddingSize - ((n.Size + 16 + 4) % NeedlePaddingSize)
+		bodyLength = n.Size + 4 + rest
+	} else if version == Version2 {
+	}
+	return
+}
+
+//n should be a needle already read the header
+//the input stream will read until next file entry
+func (n *Needle) ReadNeedleBody(r *os.File, version Version, bodyLength uint32) {
+	if version == Version1 {
+		bytes := make([]byte, bodyLength)
+		r.Read(bytes)
+		n.Data = bytes[:n.Size]
+		n.Checksum = NewCRC(n.Data)
 	} else if version == Version2 {
 	}
 	return
diff --git a/weed-fs/src/pkg/storage/volume.go b/weed-fs/src/pkg/storage/volume.go
index a9ffe4385..d12c9d889 100644
--- a/weed-fs/src/pkg/storage/volume.go
+++ b/weed-fs/src/pkg/storage/volume.go
@@ -105,7 +105,7 @@ func (v *Volume) write(n *Needle) uint32 {
 	v.accessLock.Lock()
 	defer v.accessLock.Unlock()
 	offset, _ := v.dataFile.Seek(0, 2)
-	ret := n.Append(v.dataFile)
+	ret := n.Append(v.dataFile, v.version)
 	nv, ok := v.nm.Get(n.Id)
 	if !ok || int64(nv.Offset)*8 < offset {
 		v.nm.Put(n.Id, uint32(offset/8), n.Size)
@@ -119,8 +119,8 @@ func (v *Volume) delete(n *Needle) uint32 {
 	//log.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
 	if ok {
 		v.nm.Delete(n.Id)
-		v.dataFile.Seek(int64(nv.Offset*8), 0)
-		n.Append(v.dataFile)
+		v.dataFile.Seek(int64(nv.Offset*NeedlePaddingSize), 0)
+		n.Append(v.dataFile, v.version)
 		return nv.Size
 	}
 	return 0
@@ -131,7 +131,7 @@ func (v *Volume) read(n *Needle) (int, error) {
 	defer v.accessLock.Unlock()
 	nv, ok := v.nm.Get(n.Id)
 	if ok && nv.Offset > 0 {
-		v.dataFile.Seek(int64(nv.Offset)*8, 0)
+		v.dataFile.Seek(int64(nv.Offset)*NeedlePaddingSize, 0)
 		return n.Read(v.dataFile, nv.Size, v.version)
 	}
 	return -1, errors.New("Not Found")
@@ -192,30 +192,28 @@ func (v *Volume) copyDataAndGenerateIndexFile(srcName, dstName, idxName string)
 
 	version, _, _ := ParseSuperBlock(header)
 
-	n, rest := ReadNeedle(src, version)
+	n, rest := ReadNeedleHeader(src, version)
 	nm := NewNeedleMap(idx)
 	old_offset := uint32(SuperBlockSize)
 	new_offset := uint32(SuperBlockSize)
 	for n != nil {
 		nv, ok := v.nm.Get(n.Id)
 		//log.Println("file size is", n.Size, "rest", rest)
-		if !ok || nv.Offset*8 != old_offset {
+		if !ok || nv.Offset*NeedlePaddingSize != old_offset {
 			src.Seek(int64(rest), 1)
 		} else {
 			if nv.Size > 0 {
-				nm.Put(n.Id, new_offset/8, n.Size)
-				bytes := make([]byte, n.Size+4)
-				src.Read(bytes)
-				n.Data = bytes[:n.Size]
-				n.Checksum = NewCRC(n.Data)
-				n.Append(dst)
-				new_offset += rest + 16
+				nm.Put(n.Id, new_offset/NeedlePaddingSize, n.Size)
+				n.ReadNeedleBody(src, version, rest)
+				n.Append(dst, v.version)
+				new_offset += rest + NeedleHeaderSize
 				//log.Println("saving key", n.Id, "volume offset", old_offset, "=>", new_offset, "data_size", n.Size, "rest", rest)
+			} else {
+				src.Seek(int64(rest), 1)
 			}
-			src.Seek(int64(rest-n.Size-4), 1)
 		}
-		old_offset += rest + 16
-		n, rest = ReadNeedle(src, version)
+		old_offset += rest + NeedleHeaderSize
+		n, rest = ReadNeedleHeader(src, version)
 	}
 
 	return nil