diff --git a/mp4.go b/mp4.go
index f18aed1..c83275c 100644
--- a/mp4.go
+++ b/mp4.go
@@ -69,7 +69,7 @@ func ReadAtoms(r io.ReadSeeker) (Metadata, error) {
 	return m, err
 }
 
-func (m metadataMP4) readAtoms(r io.Reader) error {
+func (m metadataMP4) readAtoms(r io.ReadSeeker) error {
 	for {
 		var size uint32
 		err := binary.Read(r, binary.BigEndian, &size)
@@ -96,7 +96,10 @@ func (m metadataMP4) readAtoms(r io.Reader) error {
 		case "moov", "udta", "ilst":
 			return m.readAtoms(r)
 		case "free":
-			discardN(r, int64(size-8))
+			_, err := r.Seek(int64(size-8), os.SEEK_CUR)
+			if err != nil {
+				return err
+			}
 			continue
 		case "mdat": // stop when we get to the data
 			return nil
diff --git a/util.go b/util.go
index f01636e..5087ce8 100644
--- a/util.go
+++ b/util.go
@@ -6,14 +6,8 @@ package tag
 
 import (
 	"io"
-	"io/ioutil"
 )
 
-func discardN(r io.Reader, n int64) error {
-	_, err := io.CopyN(ioutil.Discard, r, n)
-	return err
-}
-
 func getBit(b byte, n uint) bool {
 	x := byte(1 << n)
 	return (b & x) == x