diff --git a/sysfs/mdraid.go b/sysfs/mdraid.go
index 139c7ebe..d44414e0 100644
--- a/sysfs/mdraid.go
+++ b/sysfs/mdraid.go
@@ -136,7 +136,7 @@ func (fs FS) Mdraids() ([]Mdraid, error) {
 			}
 
 			if val, err := util.SysReadFile(filepath.Join(path, "sync_completed")); err == nil {
-				if val != "none" {
+				if val != "none" && val != "delayed" {
 					var a, b uint64
 
 					// File contains two values representing the fraction of number of completed
diff --git a/sysfs/mdraid_test.go b/sysfs/mdraid_test.go
index cef9a342..59a88b7b 100644
--- a/sysfs/mdraid_test.go
+++ b/sysfs/mdraid_test.go
@@ -131,3 +131,26 @@ func TestMdraidStats(t *testing.T) {
 		t.Fatalf("unexpected Mdraid (-want +got):\n%s", diff)
 	}
 }
+func TestMdraidDelayedSyncCompleted(t *testing.T) {
+	fs, err := NewFS("testdata/fixtures/sys/issue770")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	mdraids, err := fs.Mdraids()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(mdraids) != 1 {
+		t.Fatalf("expected 1 mdraid, got %d", len(mdraids))
+	}
+
+	md := mdraids[0]
+	if md.SyncCompleted != 0 {
+		t.Fatalf("expected SyncCompleted=0 for 'delayed' state, got %f", md.SyncCompleted)
+	}
+	if md.SyncAction != "resync" {
+		t.Fatalf("expected SyncAction='resync', got '%s'", md.SyncAction)
+	}
+}
diff --git a/testdata/issue770/block/md127/md/array_state b/testdata/issue770/block/md127/md/array_state
new file mode 100644
index 00000000..83126302
--- /dev/null
+++ b/testdata/issue770/block/md127/md/array_state
@@ -0,0 +1 @@
+clean
diff --git a/testdata/issue770/block/md127/md/chunk_size b/testdata/issue770/block/md127/md/chunk_size
new file mode 100644
index 00000000..c0758e93
--- /dev/null
+++ b/testdata/issue770/block/md127/md/chunk_size
@@ -0,0 +1 @@
+524288
diff --git a/testdata/issue770/block/md127/md/degraded b/testdata/issue770/block/md127/md/degraded
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/testdata/issue770/block/md127/md/degraded
@@ -0,0 +1 @@
+0
diff --git a/testdata/issue770/block/md127/md/dev-sdaa/state b/testdata/issue770/block/md127/md/dev-sdaa/state
new file mode 100644
index 00000000..cb75ec0a
--- /dev/null
+++ b/testdata/issue770/block/md127/md/dev-sdaa/state
@@ -0,0 +1 @@
+spare
diff --git a/testdata/issue770/block/md127/md/dev-sdn/state b/testdata/issue770/block/md127/md/dev-sdn/state
new file mode 100644
index 00000000..96499100
--- /dev/null
+++ b/testdata/issue770/block/md127/md/dev-sdn/state
@@ -0,0 +1 @@
+in_sync
diff --git a/testdata/issue770/block/md127/md/dev-sdo/state b/testdata/issue770/block/md127/md/dev-sdo/state
new file mode 100644
index 00000000..96499100
--- /dev/null
+++ b/testdata/issue770/block/md127/md/dev-sdo/state
@@ -0,0 +1 @@
+in_sync
diff --git a/testdata/issue770/block/md127/md/dev-sdp/state b/testdata/issue770/block/md127/md/dev-sdp/state
new file mode 100644
index 00000000..ddae9041
--- /dev/null
+++ b/testdata/issue770/block/md127/md/dev-sdp/state
@@ -0,0 +1 @@
+faulty
diff --git a/testdata/issue770/block/md127/md/level b/testdata/issue770/block/md127/md/level
new file mode 100644
index 00000000..341b806e
--- /dev/null
+++ b/testdata/issue770/block/md127/md/level
@@ -0,0 +1 @@
+raid1
diff --git a/testdata/issue770/block/md127/md/metadata_version b/testdata/issue770/block/md127/md/metadata_version
new file mode 100644
index 00000000..5625e59d
--- /dev/null
+++ b/testdata/issue770/block/md127/md/metadata_version
@@ -0,0 +1 @@
+1.2
diff --git a/testdata/issue770/block/md127/md/raid_disks b/testdata/issue770/block/md127/md/raid_disks
new file mode 100644
index 00000000..00750edc
--- /dev/null
+++ b/testdata/issue770/block/md127/md/raid_disks
@@ -0,0 +1 @@
+3
diff --git a/testdata/issue770/block/md127/md/sync_action b/testdata/issue770/block/md127/md/sync_action
new file mode 100644
index 00000000..efa2f3d7
--- /dev/null
+++ b/testdata/issue770/block/md127/md/sync_action
@@ -0,0 +1 @@
+resync
diff --git a/testdata/issue770/block/md127/md/sync_completed b/testdata/issue770/block/md127/md/sync_completed
new file mode 100644
index 00000000..5339daa0
--- /dev/null
+++ b/testdata/issue770/block/md127/md/sync_completed
@@ -0,0 +1 @@
+delayed
diff --git a/testdata/issue770/block/md127/md/uuid b/testdata/issue770/block/md127/md/uuid
new file mode 100644
index 00000000..21421dbd
--- /dev/null
+++ b/testdata/issue770/block/md127/md/uuid
@@ -0,0 +1 @@
+7615b98d-f2ba-4d99-bee8-6202d8e130b9