diff --git a/db.go b/db.go
index 9348c97b6..fef92e755 100644
--- a/db.go
+++ b/db.go
@@ -60,7 +60,7 @@ func NewDB(path, name string) (*DB, error) {
 		frames:         make(map[string]*Frame),
 		remoteMaxSlice: 0,
 
-		profileAttrStore: NewAttrStore(filepath.Join(path, "data")),
+		profileAttrStore: NewAttrStore(filepath.Join(path, ".data")),
 
 		columnLabel: DefaultColumnLabel,
 
@@ -165,7 +165,7 @@ func (db *DB) loadMeta() error {
 	var pb internal.DB
 
 	// Read data from meta file.
-	buf, err := ioutil.ReadFile(filepath.Join(db.path, "meta"))
+	buf, err := ioutil.ReadFile(filepath.Join(db.path, ".meta"))
 	if os.IsNotExist(err) {
 		db.timeQuantum = ""
 		db.columnLabel = DefaultColumnLabel
@@ -197,7 +197,7 @@ func (db *DB) saveMeta() error {
 	}
 
 	// Write to meta file.
-	if err := ioutil.WriteFile(filepath.Join(db.path, "meta"), buf, 0666); err != nil {
+	if err := ioutil.WriteFile(filepath.Join(db.path, ".meta"), buf, 0666); err != nil {
 		return err
 	}
 
diff --git a/frame.go b/frame.go
index fa47517c5..8ff32f761 100644
--- a/frame.go
+++ b/frame.go
@@ -58,7 +58,7 @@ func NewFrame(path, db, name string) (*Frame, error) {
 		name: name,
 
 		fragments:       make(map[uint64]*Fragment),
-		bitmapAttrStore: NewAttrStore(filepath.Join(path, "data")),
+		bitmapAttrStore: NewAttrStore(filepath.Join(path, ".data")),
 
 		stats: NopStatsClient,
 
@@ -202,7 +202,7 @@ func (f *Frame) loadMeta() error {
 	var pb internal.Frame
 
 	// Read data from meta file.
-	buf, err := ioutil.ReadFile(filepath.Join(f.path, "meta"))
+	buf, err := ioutil.ReadFile(filepath.Join(f.path, ".meta"))
 	if os.IsNotExist(err) {
 		f.timeQuantum = ""
 		f.rowLabel = DefaultRowLabel
@@ -234,7 +234,7 @@ func (f *Frame) saveMeta() error {
 	}
 
 	// Write to meta file.
-	if err := ioutil.WriteFile(filepath.Join(f.path, "meta"), buf, 0666); err != nil {
+	if err := ioutil.WriteFile(filepath.Join(f.path, ".meta"), buf, 0666); err != nil {
 		return err
 	}
 
diff --git a/frame_test.go b/frame_test.go
index 042bd751e..5b03cfb3e 100644
--- a/frame_test.go
+++ b/frame_test.go
@@ -106,13 +106,13 @@ func (f *Frame) Reopen() error {
 	return nil
 }
 
-// NewFrame returns a new instance of Frame d/0.
+// NewFrame does not return a frame when name is invalid.
 func TestFrame_NameRestriction(t *testing.T) {
 	path, err := ioutil.TempDir("", "pilosa-frame-")
 	if err != nil {
 		panic(err)
 	}
-	frame, err := pilosa.NewFrame(path, "d", "ABC")
+	frame, err := pilosa.NewFrame(path, "d", ".meta")
 	if frame != nil {
 		t.Fatalf("unexpected frame name %s", err)
 	}
diff --git a/handler_test.go b/handler_test.go
index 3a3ad3047..099d85074 100644
--- a/handler_test.go
+++ b/handler_test.go
@@ -605,7 +605,7 @@ func TestHandler_Frame_AttrStore_Diff(t *testing.T) {
 
 	// Set attributes on the database.
 	d := idx.MustCreateDBIfNotExists("d", pilosa.DBOptions{})
-	f, err := d.CreateFrameIfNotExists("f", pilosa.FrameOptions{})
+	f, err := d.CreateFrameIfNotExists("meta", pilosa.FrameOptions{})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -631,7 +631,7 @@ func TestHandler_Frame_AttrStore_Diff(t *testing.T) {
 	resp, err := http.Post(
 		s.URL+"/frame/attr/diff?db=d",
 		"application/json",
-		strings.NewReader(`{"db":"d", "frame":"f", "blocks":`+string(MustMarshalJSON(blks))+`}`),
+		strings.NewReader(`{"db":"d", "frame":"meta", "blocks":`+string(MustMarshalJSON(blks))+`}`),
 	)
 	if err != nil {
 		t.Fatal(err)
diff --git a/pilosa.go b/pilosa.go
index d2df7c5ed..d7e61e46b 100644
--- a/pilosa.go
+++ b/pilosa.go
@@ -29,7 +29,7 @@ var (
 
 // Regular expression to valuate db and frame's name
 // Todo: remove . when frame doesn't require . for topN
-var nameRegexp = regexp.MustCompile(`^([a-z0-9._-]{1,64}$)`)
+var nameRegexp = regexp.MustCompile(`^[a-z0-9][a-z0-9._-]{0,64}$`)
 
 // Profile represents vertical column in a database.
 // A profile can have a set of attributes attached to it.