diff --git a/weed/filer/filechunk_section_test.go b/weed/filer/filechunk_section_test.go
index e4536540b..7b76c8456 100644
--- a/weed/filer/filechunk_section_test.go
+++ b/weed/filer/filechunk_section_test.go
@@ -7,31 +7,31 @@ import (
 
 func Test_removeGarbageChunks(t *testing.T) {
 	section := NewFileChunkSection(0)
-	section.addChunk(&filer_pb.FileChunk{
+	section.chunks = append(section.chunks, &filer_pb.FileChunk{
 		FileId:       "0",
 		Offset:       0,
 		Size:         1,
 		ModifiedTsNs: 0,
 	})
-	section.addChunk(&filer_pb.FileChunk{
+	section.chunks = append(section.chunks, &filer_pb.FileChunk{
 		FileId:       "1",
 		Offset:       1,
 		Size:         1,
 		ModifiedTsNs: 1,
 	})
-	section.addChunk(&filer_pb.FileChunk{
+	section.chunks = append(section.chunks, &filer_pb.FileChunk{
 		FileId:       "2",
 		Offset:       2,
 		Size:         1,
 		ModifiedTsNs: 2,
 	})
-	section.addChunk(&filer_pb.FileChunk{
+	section.chunks = append(section.chunks, &filer_pb.FileChunk{
 		FileId:       "3",
 		Offset:       3,
 		Size:         1,
 		ModifiedTsNs: 3,
 	})
-	section.addChunk(&filer_pb.FileChunk{
+	section.chunks = append(section.chunks, &filer_pb.FileChunk{
 		FileId:       "4",
 		Offset:       4,
 		Size:         1,
diff --git a/weed/mount/page_writer/page_chunk_mem.go b/weed/mount/page_writer/page_chunk_mem.go
index cbd82c953..3928f7077 100644
--- a/weed/mount/page_writer/page_chunk_mem.go
+++ b/weed/mount/page_writer/page_chunk_mem.go
@@ -105,4 +105,18 @@ func (mc *MemChunk) SaveContent(saveFn SaveToStorageFunc) {
 		saveFn(reader, int64(mc.logicChunkIndex)*mc.chunkSize+t.StartOffset, t.Size(), t.TsNs, func() {
 		})
 	}
+
+	for t := mc.usage.head.next; t != mc.usage.tail; t = t.next {
+		startOffset := t.StartOffset
+		stopOffset := t.stopOffset
+		tsNs := t.TsNs
+		for t != mc.usage.tail && t.next.StartOffset == stopOffset {
+			stopOffset = t.next.stopOffset
+			t = t.next
+			tsNs = max(tsNs, t.TsNs)
+		}
+		reader := util.NewBytesReader(mc.buf[startOffset:stopOffset])
+		saveFn(reader, int64(mc.logicChunkIndex)*mc.chunkSize+startOffset, stopOffset-startOffset, tsNs, func() {
+		})
+	}
 }
diff --git a/weed/mount/page_writer/page_chunk_swapfile.go b/weed/mount/page_writer/page_chunk_swapfile.go
index 10060bef9..a1d9c04fa 100644
--- a/weed/mount/page_writer/page_chunk_swapfile.go
+++ b/weed/mount/page_writer/page_chunk_swapfile.go
@@ -176,11 +176,20 @@ func (sc *SwapFileChunk) SaveContent(saveFn SaveToStorageFunc) {
 	}
 	// println(sc.logicChunkIndex, "|", "save")
 	for t := sc.usage.head.next; t != sc.usage.tail; t = t.next {
-		data := mem.Allocate(int(t.Size()))
-		n, _ := sc.swapfile.file.ReadAt(data, t.StartOffset+int64(sc.actualChunkIndex)*sc.swapfile.chunkSize)
+		startOffset := t.StartOffset
+		stopOffset := t.stopOffset
+		tsNs := t.TsNs
+		for t != sc.usage.tail && t.next.StartOffset == stopOffset {
+			stopOffset = t.next.stopOffset
+			t = t.next
+			tsNs = max(tsNs, t.TsNs)
+		}
+
+		data := mem.Allocate(int(stopOffset - startOffset))
+		n, _ := sc.swapfile.file.ReadAt(data, startOffset+int64(sc.actualChunkIndex)*sc.swapfile.chunkSize)
 		if n > 0 {
 			reader := util.NewBytesReader(data[:n])
-			saveFn(reader, int64(sc.logicChunkIndex)*sc.swapfile.chunkSize+t.StartOffset, int64(n), t.TsNs, func() {
+			saveFn(reader, int64(sc.logicChunkIndex)*sc.swapfile.chunkSize+startOffset, int64(n), tsNs, func() {
 			})
 		}
 		mem.Free(data)