diff --git a/archive/pfs/chunk/chunk.go b/archive/pfs/chunk/chunk.go
new file mode 100644
index 0000000..aaa1bfb
--- /dev/null
+++ b/archive/pfs/chunk/chunk.go
@@ -0,0 +1,23 @@
+package chunk
+
+import (
+	"io"
+
+	"github.com/giolekva/pcloud/pfs/api"
+)
+
+type ChunkInfo struct {
+	Status    api.ChunkStatus
+	Size      int
+	Committed int
+}
+
+type Chunk interface {
+	Stats() (ChunkInfo, error)
+	ReaderAt() io.ReaderAt
+	WriterAt() io.WriterAt
+}
+
+type ChunkFactory interface {
+	New(size int) Chunk
+}