diff --git a/weed/storage/volume_ttl.go b/weed/storage/volume_ttl.go
index 4318bb048..0989e7a49 100644
--- a/weed/storage/volume_ttl.go
+++ b/weed/storage/volume_ttl.go
@@ -16,8 +16,8 @@ const (
 )
 
 type TTL struct {
-	count byte
-	unit  byte
+	Count byte
+	Unit  byte
 }
 
 var EMPTY_TTL = &TTL{}
@@ -43,12 +43,12 @@ func ReadTTL(ttlString string) (*TTL, error) {
 	}
 	count, err := strconv.Atoi(string(countBytes))
 	unit := toStoredByte(unitByte)
-	return &TTL{count: byte(count), unit: unit}, err
+	return &TTL{Count: byte(count), Unit: unit}, err
 }
 
 // read stored bytes to a ttl
 func LoadTTLFromBytes(input []byte) (t *TTL) {
-	return &TTL{count: input[0], unit: input[1]}
+	return &TTL{Count: input[0], Unit: input[1]}
 }
 
 // read stored bytes to a ttl
@@ -61,25 +61,25 @@ func LoadTTLFromUint32(ttl uint32) (t *TTL) {
 
 // save stored bytes to an output with 2 bytes
 func (t *TTL) ToBytes(output []byte) {
-	output[0] = t.count
-	output[1] = t.unit
+	output[0] = t.Count
+	output[1] = t.Unit
 }
 
 func (t *TTL) ToUint32() (output uint32) {
-	output = uint32(t.count) << 8
-	output += uint32(t.unit)
+	output = uint32(t.Count) << 8
+	output += uint32(t.Unit)
 	return output
 }
 
 func (t *TTL) String() string {
-	if t == nil || t.count == 0 {
+	if t == nil || t.Count == 0 {
 		return ""
 	}
-	if t.unit == Empty {
+	if t.Unit == Empty {
 		return ""
 	}
-	countString := strconv.Itoa(int(t.count))
-	switch t.unit {
+	countString := strconv.Itoa(int(t.Count))
+	switch t.Unit {
 	case Minute:
 		return countString + "m"
 	case Hour:
@@ -115,21 +115,21 @@ func toStoredByte(readableUnitByte byte) byte {
 }
 
 func (t TTL) Minutes() uint32 {
-	switch t.unit {
+	switch t.Unit {
 	case Empty:
 		return 0
 	case Minute:
-		return uint32(t.count)
+		return uint32(t.Count)
 	case Hour:
-		return uint32(t.count) * 60
+		return uint32(t.Count) * 60
 	case Day:
-		return uint32(t.count) * 60 * 24
+		return uint32(t.Count) * 60 * 24
 	case Week:
-		return uint32(t.count) * 60 * 24 * 7
+		return uint32(t.Count) * 60 * 24 * 7
 	case Month:
-		return uint32(t.count) * 60 * 24 * 31
+		return uint32(t.Count) * 60 * 24 * 31
 	case Year:
-		return uint32(t.count) * 60 * 24 * 365
+		return uint32(t.Count) * 60 * 24 * 365
 	}
 	return 0
 }