diff --git a/pkg/storage/migrator/migrator_s3_assisted_test.go b/pkg/storage/migrator/migrator_s3_assisted_test.go
index d67fda56..751c101c 100644
--- a/pkg/storage/migrator/migrator_s3_assisted_test.go
+++ b/pkg/storage/migrator/migrator_s3_assisted_test.go
@@ -153,9 +153,6 @@ func TestMigratorS3Assisted(t *testing.T) {
 		go func() {
 			_ = destFrom.HandleWriteAt()
 		}()
-		go func() {
-			_ = destFrom.HandleWriteAtHash()
-		}()
 		go func() {
 			_ = destFrom.HandleDevInfo()
 		}()
@@ -280,9 +277,6 @@ func TestMigratorS3AssistedChangeSource(t *testing.T) {
 		go func() {
 			_ = destFrom.HandleWriteAt()
 		}()
-		go func() {
-			_ = destFrom.HandleWriteAtHash()
-		}()
 		go func() {
 			_ = destFrom.HandleDevInfo()
 		}()
diff --git a/pkg/storage/protocol/from_protocol.go b/pkg/storage/protocol/from_protocol.go
index d0248023..228f3232 100644
--- a/pkg/storage/protocol/from_protocol.go
+++ b/pkg/storage/protocol/from_protocol.go
@@ -311,62 +311,46 @@ func (fp *FromProtocol) HandleWriteAt() error {
 
 		offset, write_data, err := packets.DecodeWriteAt(data)
 		if err != nil {
-			return err
-		}
+			// It could be a WriteAtHash command...
+			_, length, _, errWriteAtHash := packets.DecodeWriteAtHash(data)
+			if errWriteAtHash != nil {
+				return err
+			}
+
+			// For now, we will simply ack. We do NOT mark it as present. That part will be done when the alternateSources is retrieved.
+			// fp.mark_range_present(int(offset), int(length))
 
-		// Handle in a goroutine
-		go func(goffset int64, gdata []byte, gid uint32) {
-			n, err := fp.prov.WriteAt(gdata, goffset)
 			war := &packets.WriteAtResponse{
-				Bytes: n,
-				Error: err,
+				Error: nil,
+				Bytes: int(length),
 			}
-			if err == nil {
-				fp.mark_range_present(int(goffset), len(gdata))
-			}
-			_, err = fp.protocol.SendPacket(fp.dev, gid, packets.EncodeWriteAtResponse(war))
+			_, err = fp.protocol.SendPacket(fp.dev, id, packets.EncodeWriteAtResponse(war))
 			if err != nil {
-				errLock.Lock()
-				errValue = err
-				errLock.Unlock()
+				return err
 			}
-		}(offset, write_data, id)
-	}
-}
-
-// Handle any WriteAtHash commands. (We simply acknowledge)
-func (fp *FromProtocol) HandleWriteAtHash() error {
-	err := fp.wait_init_or_cancel()
-	if err != nil {
-		return err
-	}
-
-	for {
-		id, data, err := fp.protocol.WaitForCommand(fp.dev, packets.COMMAND_WRITE_AT_HASH)
-		if err != nil {
-			return err
-		}
-
-		_, length, _, err := packets.DecodeWriteAtHash(data)
-		if err != nil {
-			return err
-		}
-
-		// For now, we will simply ack. We do NOT mark it as present. That part will be done when the alternateSources is retrieved.
-		// fp.mark_range_present(int(offset), int(length))
-
-		war := &packets.WriteAtResponse{
-			Error: nil,
-			Bytes: int(length),
-		}
-		_, err = fp.protocol.SendPacket(fp.dev, id, packets.EncodeWriteAtResponse(war))
-		if err != nil {
-			return err
+		} else {
+			// Handle in a goroutine
+			go func(goffset int64, gdata []byte, gid uint32) {
+				n, err := fp.prov.WriteAt(gdata, goffset)
+				war := &packets.WriteAtResponse{
+					Bytes: n,
+					Error: err,
+				}
+				if err == nil {
+					fp.mark_range_present(int(goffset), len(gdata))
+				}
+				_, err = fp.protocol.SendPacket(fp.dev, gid, packets.EncodeWriteAtResponse(war))
+				if err != nil {
+					errLock.Lock()
+					errValue = err
+					errLock.Unlock()
+				}
+			}(offset, write_data, id)
 		}
 	}
 }
 
-// Handle any WriteAt commands, and send to provider
+// Handle any WriteAtWithMap commands, and send to provider
 func (fp *FromProtocol) HandleWriteAtWithMap(cb func(offset int64, data []byte, idmap map[uint64]uint64) error) error {
 	err := fp.wait_init_or_cancel()
 	if err != nil {
diff --git a/pkg/storage/protocol/packets/packet.go b/pkg/storage/protocol/packets/packet.go
index 6ca67aff..3dabb32e 100644
--- a/pkg/storage/protocol/packets/packet.go
+++ b/pkg/storage/protocol/packets/packet.go
@@ -16,8 +16,7 @@ const (
 	COMMAND_WRITE_AT_WITH_MAP = COMMAND_REQUEST | byte(10)
 	COMMAND_REMOVE_DEV        = COMMAND_REQUEST | byte(11)
 	COMMAND_REMOVE_FROM_MAP   = COMMAND_REQUEST | byte(12)
-	COMMAND_WRITE_AT_HASH     = COMMAND_REQUEST | byte(13)
-	COMMAND_ALTERNATE_SOURCES = COMMAND_REQUEST | byte(14)
+	COMMAND_ALTERNATE_SOURCES = COMMAND_REQUEST | byte(13)
 )
 
 const (
diff --git a/pkg/storage/protocol/packets/write_at.go b/pkg/storage/protocol/packets/write_at.go
index e3df1d55..e8460c0a 100644
--- a/pkg/storage/protocol/packets/write_at.go
+++ b/pkg/storage/protocol/packets/write_at.go
@@ -6,19 +6,24 @@ import (
 	"io"
 )
 
+const WRITE_AT_DATA = 0
+const WRITE_AT_HASH = 1
+
 func EncodeWriteAt(offset int64, data []byte) []byte {
-	buff := make([]byte, 1+8+len(data))
+	buff := make([]byte, 2+8+len(data))
 	buff[0] = COMMAND_WRITE_AT
-	binary.LittleEndian.PutUint64(buff[1:], uint64(offset))
-	copy(buff[9:], data)
+	buff[1] = WRITE_AT_DATA
+	binary.LittleEndian.PutUint64(buff[2:], uint64(offset))
+	copy(buff[10:], data)
 	return buff
 }
 
 func EncodeWriterWriteAt(offset int64, data []byte) (uint32, func(w io.Writer) error) {
-	return uint32(9 + len(data)), func(w io.Writer) error {
-		header := make([]byte, 1+8)
+	return uint32(10 + len(data)), func(w io.Writer) error {
+		header := make([]byte, 2+8)
 		header[0] = COMMAND_WRITE_AT
-		binary.LittleEndian.PutUint64(header[1:], uint64(offset))
+		header[1] = WRITE_AT_DATA
+		binary.LittleEndian.PutUint64(header[2:], uint64(offset))
 		_, err := w.Write(header)
 		if err != nil {
 			return err
@@ -29,11 +34,11 @@ func EncodeWriterWriteAt(offset int64, data []byte) (uint32, func(w io.Writer) e
 }
 
 func DecodeWriteAt(buff []byte) (offset int64, data []byte, err error) {
-	if buff == nil || len(buff) < 9 || buff[0] != COMMAND_WRITE_AT {
+	if buff == nil || len(buff) < 10 || buff[0] != COMMAND_WRITE_AT || buff[1] != WRITE_AT_DATA {
 		return 0, nil, errors.New("Invalid packet command")
 	}
-	off := int64(binary.LittleEndian.Uint64(buff[1:]))
-	return off, buff[9:], nil
+	off := int64(binary.LittleEndian.Uint64(buff[2:]))
+	return off, buff[10:], nil
 }
 
 type WriteAtResponse struct {
diff --git a/pkg/storage/protocol/packets/write_at_hash.go b/pkg/storage/protocol/packets/write_at_hash.go
index e145e084..9e263ea1 100644
--- a/pkg/storage/protocol/packets/write_at_hash.go
+++ b/pkg/storage/protocol/packets/write_at_hash.go
@@ -9,23 +9,23 @@ import (
 func EncodeWriteAtHash(offset int64, length int64, hash []byte) []byte {
 	var buff bytes.Buffer
 
-	buff.WriteByte(COMMAND_WRITE_AT_HASH)
+	buff.WriteByte(COMMAND_WRITE_AT)
+	buff.WriteByte(WRITE_AT_HASH)
 	b := make([]byte, 8)
 	binary.LittleEndian.PutUint64(b, uint64(offset))
 	buff.Write(b)
 	binary.LittleEndian.PutUint64(b, uint64(length))
 	buff.Write(b)
 	buff.Write(hash)
-
 	return buff.Bytes()
 }
 
 func DecodeWriteAtHash(buff []byte) (offset int64, length int64, hash []byte, err error) {
-	if buff == nil || len(buff) < 17 || buff[0] != COMMAND_WRITE_AT_HASH {
+	if buff == nil || len(buff) < 18 || buff[0] != COMMAND_WRITE_AT || buff[1] != WRITE_AT_HASH {
 		return 0, 0, nil, errors.New("invalid packet command")
 	}
-	off := int64(binary.LittleEndian.Uint64(buff[1:]))
-	l := int64(binary.LittleEndian.Uint64(buff[9:]))
+	off := int64(binary.LittleEndian.Uint64(buff[2:]))
+	l := int64(binary.LittleEndian.Uint64(buff[10:]))
 
-	return off, l, buff[17:], nil
+	return off, l, buff[18:], nil
 }