diff --git a/blobstore/common/crc32block/sized_coder.go b/blobstore/common/crc32block/sized_coder.go
index 0defa41a4..57920e54f 100644
--- a/blobstore/common/crc32block/sized_coder.go
+++ b/blobstore/common/crc32block/sized_coder.go
@@ -17,13 +17,14 @@ package crc32block
 import (
 	"encoding"
 	"encoding/binary"
-	"errors"
 	"fmt"
 	"hash"
 	"hash/crc32"
 	"io"
 	"sync"
-	// "github.com/cubefs/cubefs/blobstore/common/rpc2/transport"
+
+	"github.com/cubefs/cubefs/blobstore/common/rpc2/transport"
+	"github.com/cubefs/cubefs/blobstore/util"
 )
 
 // Notice: All closer in this file must close once at most.
@@ -49,13 +50,11 @@ const (
 	ModeBlockEncode uint8 = 11 // encode mode, crc at head of block
 	ModeBlockDecode uint8 = 12 // decode, return buffer with crc size and head
 
-	// TODO: transport
-	// _alignment     = transport.Alignment
-	_alignment     = 512
+	_alignment     = transport.Alignment
 	_alignmentMask = _alignment - 1
 )
 
-var ErrFrameContinue = errors.New("crc32block: add back later")
+var ErrFrameContinue = transport.ErrFrameContinue
 
 var (
 	be         = binary.BigEndian
@@ -128,8 +127,8 @@ func newSizedRangeDecoder(rc io.ReadCloser,
 ) (int64, int64, io.ReadCloser) {
 	payload := BlockPayload(blockSize)
 
-	head := from % payload
-	tail := (payload - to%payload) % payload
+	head := util.AlignedHead(from, payload)
+	tail := util.AlignedTail(to, payload)
 	if more := to + tail; more > actualSize {
 		tail -= more - actualSize
 	}
@@ -765,8 +764,8 @@ func NewSizedFixer(rc io.ReadCloser, actualSize, from, to, blockSize int64) (int
 	}
 	payload := BlockPayload(blockSize)
 
-	head := from % payload
-	tail := (payload - to%payload) % payload
+	head := util.AlignedHead(from, payload)
+	tail := util.AlignedTail(to, payload)
 	if more := to + tail; more > actualSize {
 		tail -= more - actualSize
 	}
diff --git a/blobstore/common/crc32block/sized_coder_test.go b/blobstore/common/crc32block/sized_coder_test.go
index 796332435..3c6caffa3 100644
--- a/blobstore/common/crc32block/sized_coder_test.go
+++ b/blobstore/common/crc32block/sized_coder_test.go
@@ -180,7 +180,7 @@ func (aw *appendWriter) Write(p []byte) (int, error) {
 func (*appendWriter) Read(p []byte) (int, error) { return 0, io.EOF }
 func (*appendWriter) Close() error               { return nil }
 
-// TODO: remove
+// TODO: replace with io.NopCloser in higher golang version.
 func nopCloser(r io.Reader) io.ReadCloser {
 	if _, ok := r.(io.WriterTo); ok {
 		return nopCloserWriterTo{r}
diff --git a/blobstore/common/kvstorev2/kvstore.go b/blobstore/common/kvstorev2/kvstore.go
index 44b9d556e..6c9ffd0f0 100644
--- a/blobstore/common/kvstorev2/kvstore.go
+++ b/blobstore/common/kvstorev2/kvstore.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/common/kvstorev2/kvstore_test.go b/blobstore/common/kvstorev2/kvstore_test.go
index bd893b121..bfe3e5e1e 100644
--- a/blobstore/common/kvstorev2/kvstore_test.go
+++ b/blobstore/common/kvstorev2/kvstore_test.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/common/kvstorev2/rocksdb.go b/blobstore/common/kvstorev2/rocksdb.go
index db48f222d..60363d6a9 100644
--- a/blobstore/common/kvstorev2/rocksdb.go
+++ b/blobstore/common/kvstorev2/rocksdb.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/common/kvstorev2/rocksdb_test.go b/blobstore/common/kvstorev2/rocksdb_test.go
index 4c4909ee5..70ab4c2b1 100644
--- a/blobstore/common/kvstorev2/rocksdb_test.go
+++ b/blobstore/common/kvstorev2/rocksdb_test.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/common/tcmalloc/tcmalloc.go b/blobstore/common/tcmalloc/tcmalloc.go
index 8df7238cb..d269940f5 100644
--- a/blobstore/common/tcmalloc/tcmalloc.go
+++ b/blobstore/common/tcmalloc/tcmalloc.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/common/tcmalloc/tcmalloc_manage.cc b/blobstore/common/tcmalloc/tcmalloc_manage.cc
index dc93eb09c..a787853c9 100644
--- a/blobstore/common/tcmalloc/tcmalloc_manage.cc
+++ b/blobstore/common/tcmalloc/tcmalloc_manage.cc
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -30,4 +30,4 @@ void tcmalloc_free() {
 
 double tcmalloc_memory_release_rate() {
     return MallocExtension::instance()->GetMemoryReleaseRate();
-}
\ No newline at end of file
+}
diff --git a/blobstore/common/tcmalloc/tcmalloc_manage.h b/blobstore/common/tcmalloc/tcmalloc_manage.h
index 78a4142ec..313ca3864 100644
--- a/blobstore/common/tcmalloc/tcmalloc_manage.h
+++ b/blobstore/common/tcmalloc/tcmalloc_manage.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 The Cuber Authors.
+ * Copyright 2025 The CubeFS Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,4 +16,4 @@
 
 char* tcmalloc_stats();
 void tcmalloc_free();
-double tcmalloc_memory_release_rate();
\ No newline at end of file
+double tcmalloc_memory_release_rate();
diff --git a/blobstore/util/alignment.go b/blobstore/util/alignment.go
index 35c585076..08cfa4bd4 100644
--- a/blobstore/util/alignment.go
+++ b/blobstore/util/alignment.go
@@ -1,4 +1,4 @@
-// Copyright 2024 The Cuber Authors.
+// Copyright 2024 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -31,3 +31,13 @@ func AlignedBuffer(head, capacity, alignment int) []byte {
 	capa := offset + head + capacity
 	return buff[offset:capa:capa]
 }
+
+// AlignedHead head with alignment.
+func AlignedHead[I Integer](size, alignment I) I {
+	return size % alignment
+}
+
+// AlignedTail tail with alignment.
+func AlignedTail[I Integer](size, alignment I) I {
+	return (alignment - size%alignment) % alignment
+}
diff --git a/blobstore/util/alignment_test.go b/blobstore/util/alignment_test.go
index 3b176fe63..962765553 100644
--- a/blobstore/util/alignment_test.go
+++ b/blobstore/util/alignment_test.go
@@ -1,4 +1,4 @@
-// Copyright 2024 The Cuber Authors.
+// Copyright 2024 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -18,9 +18,11 @@ import (
 	"math/rand"
 	"testing"
 	"unsafe"
+
+	"github.com/stretchr/testify/require"
 )
 
-func TestUtilAlignment(t *testing.T) {
+func TestUtilAlignmentBuffer(t *testing.T) {
 	for _, head := range []int{0, 4, 8, 127} {
 		for _, alignment := range []int{128, 512} {
 			for range [100]struct{}{} {
@@ -34,3 +36,24 @@ func TestUtilAlignment(t *testing.T) {
 		}
 	}
 }
+
+func TestUtilAlignmentHeadTail(t *testing.T) {
+	require.Equal(t, 0, AlignedHead(0, 128))
+	require.Equal(t, int64(1), AlignedHead[int64](513, 512))
+	require.Equal(t, uint64(0), AlignedTail[uint64](512, 512))
+	require.Equal(t, uint(1023), AlignedTail[uint](1025, 1024))
+	for range [100]struct{}{} {
+		size := rand.Int63() + 1
+		alignment := rand.Int63n(1<<20) + 1
+		if rand.Int63()%7 == 0 {
+			size -= size % alignment
+		}
+		head := AlignedHead(size, alignment)
+		tail := AlignedTail(size, alignment)
+		if head == 0 {
+			require.Equal(t, int64(0), head+tail)
+		} else {
+			require.Equal(t, alignment, head+tail)
+		}
+	}
+}
diff --git a/blobstore/util/defaulter/defaulter.go b/blobstore/util/defaulter/defaulter.go
index 0552226e4..e9507c132 100644
--- a/blobstore/util/defaulter/defaulter.go
+++ b/blobstore/util/defaulter/defaulter.go
@@ -21,19 +21,15 @@ import (
 	"fmt"
 	"math"
 	"reflect"
+
+	"github.com/cubefs/cubefs/blobstore/util"
 )
 
 const zeroFloat = 1e-9
 
 type (
-	Float interface {
-		~float32 | ~float64
-	}
-	Integer interface {
-		~uintptr |
-			~int | ~int8 | ~int16 | ~int32 | ~int64 |
-			~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
-	}
+	Float   util.Float
+	Integer util.Integer
 )
 
 func FloatEqual[F Float](val *F, def F) {
diff --git a/blobstore/util/statistic/statistic.go b/blobstore/util/statistic/statistic.go
index 54b4ed54a..e5158100d 100644
--- a/blobstore/util/statistic/statistic.go
+++ b/blobstore/util/statistic/statistic.go
@@ -1,4 +1,4 @@
-// Copyright 2025 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/util/statistic/statistic_test.go b/blobstore/util/statistic/statistic_test.go
index 153a6b23c..6333ea575 100644
--- a/blobstore/util/statistic/statistic_test.go
+++ b/blobstore/util/statistic/statistic_test.go
@@ -1,4 +1,4 @@
-// Copyright 2025 The Cuber Authors.
+// Copyright 2025 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/util/types.go b/blobstore/util/types.go
new file mode 100644
index 000000000..73066d804
--- /dev/null
+++ b/blobstore/util/types.go
@@ -0,0 +1,25 @@
+// Copyright 2024 The CubeFS Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// permissions and limitations under the License.
+
+package util
+
+type Float interface {
+	~float32 | ~float64
+}
+
+type Integer interface {
+	~uintptr |
+		~int | ~int8 | ~int16 | ~int32 | ~int64 |
+		~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
+}
diff --git a/blobstore/util/util.go b/blobstore/util/util.go
index a36e8bae6..3fba5dc71 100644
--- a/blobstore/util/util.go
+++ b/blobstore/util/util.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2024 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/blobstore/util/util_test.go b/blobstore/util/util_test.go
index d1e76050b..dc1ef0939 100644
--- a/blobstore/util/util_test.go
+++ b/blobstore/util/util_test.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The Cuber Authors.
+// Copyright 2024 The CubeFS Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.