diff --git a/unmaintained/see_dat/see_dat_gzip b/unmaintained/see_dat/see_dat_gzip
new file mode 100644
index 000000000..cec073e3f
--- /dev/null
+++ b/unmaintained/see_dat/see_dat_gzip
@@ -0,0 +1,83 @@
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"crypto/md5"
+	"flag"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"time"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+type VolumeFileScanner4SeeDat struct {
+	version needle.Version
+}
+
+func (scanner *VolumeFileScanner4SeeDat) VisitSuperBlock(superBlock super_block.SuperBlock) error {
+	scanner.version = superBlock.Version
+	return nil
+}
+
+func (scanner *VolumeFileScanner4SeeDat) ReadNeedleBody() bool {
+	return true
+}
+
+var (
+	files     = int64(0)
+	filebytes = int64(0)
+	diffbytes = int64(0)
+)
+
+func Compresssion(data []byte) float64 {
+	if len(data) <= 128 {
+		return 100.0
+	}
+	compressed, _ := util.GzipData(data[0:128])
+	return float64(len(compressed)*10) / 1280.0
+}
+
+func (scanner *VolumeFileScanner4SeeDat) VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error {
+	t := time.Unix(int64(n.AppendAtNs)/int64(time.Second), int64(n.AppendAtNs)%int64(time.Second))
+	glog.V(0).Info("----------------------------------------------------------------------------------")
+	glog.V(0).Infof("%d,%s%x offset %d size %d(%s) cookie %x appendedAt %v  hasmime[%t] mime[%s] (len: %d)",
+		*volumeId, n.Id, n.Cookie, offset, n.Size, util.BytesToHumanReadable(uint64(n.Size)), n.Cookie, t, n.HasMime(), string(n.Mime), len(n.Mime))
+	r, err := gzip.NewReader(bytes.NewReader(n.Data))
+	if err == nil {
+		buf := bytes.Buffer{}
+		h := md5.New()
+		c, _ := io.Copy(&buf, r)
+		d := buf.Bytes()
+		io.Copy(h, bytes.NewReader(d))
+		diff := (int64(n.DataSize) - int64(c))
+		diffbytes += diff
+		glog.V(0).Infof("was gzip! stored_size: %d orig_size: %d diff: %d(%d) mime:%s compression-of-128: %.2f md5: %x", n.DataSize, c, diff, diffbytes, http.DetectContentType(d), Compresssion(d), h.Sum(nil))
+	} else {
+		glog.V(0).Infof("no gzip!")
+	}
+	return nil
+}
+
+var (
+	_                = ioutil.ReadAll
+	volumePath       = flag.String("dir", "/tmp", "data directory to store files")
+	volumeCollection = flag.String("collection", "", "the volume collection name")
+	volumeId         = flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir. The volume index file should not exist.")
+)
+
+func main() {
+	flag.Parse()
+	vid := needle.VolumeId(*volumeId)
+	glog.V(0).Info("Starting")
+	scanner := &VolumeFileScanner4SeeDat{}
+	err := storage.ScanVolumeFile(*volumePath, *volumeCollection, vid, storage.NeedleMapInMemory, scanner)
+	if err != nil {
+		glog.Fatalf("Reading Volume File [ERROR] %s\n", err)
+	}
+}