diff --git a/weed/shell/command_volume_check_disk_test.go b/weed/shell/command_volume_check_disk_test.go
index 727245b0d..3ec0a1729 100644
--- a/weed/shell/command_volume_check_disk_test.go
+++ b/weed/shell/command_volume_check_disk_test.go
@@ -1,7 +1,7 @@
 package shell
 
 import (
-	"os"
+	"bytes"
 	"testing"
 	"time"
 
@@ -13,66 +13,154 @@ type testCommandVolumeCheckDisk struct {
 }
 
 type shouldSkipVolume struct {
+	name              string
 	a                 VolumeReplica
 	b                 VolumeReplica
 	pulseTimeAtSecond int64
+	syncDeletions     bool
 	shouldSkipVolume  bool
 }
 
 func TestShouldSkipVolume(t *testing.T) {
 	var tests = []shouldSkipVolume{
 		{
-			VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+			name: "identical volumes should be skipped",
+			a: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
 				FileCount:        1000,
 				DeleteCount:      100,
 				ModifiedAtSecond: 1696583300},
 			},
-			VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+			b: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
 				FileCount:        1000,
 				DeleteCount:      100,
 				ModifiedAtSecond: 1696583300},
 			},
-			1696583400,
-			true,
+			pulseTimeAtSecond: 1696583400,
+			syncDeletions:     true,
+			shouldSkipVolume:  true,
 		},
 		{
-			VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+			name: "different file counts should not be skipped",
+			a: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
 				FileCount:        1001,
 				DeleteCount:      100,
 				ModifiedAtSecond: 1696583300},
 			},
-			VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+			b: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
 				FileCount:        1000,
 				DeleteCount:      100,
 				ModifiedAtSecond: 1696583300},
 			},
-			1696583400,
-			false,
+			pulseTimeAtSecond: 1696583400,
+			syncDeletions:     true,
+			shouldSkipVolume:  false,
 		},
 		{
-			VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+			name: "different delete counts with syncDeletions enabled should not be skipped",
+			a: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
 				FileCount:        1000,
 				DeleteCount:      100,
 				ModifiedAtSecond: 1696583300},
 			},
-			VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+			b: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
 				FileCount:        1000,
 				DeleteCount:      101,
 				ModifiedAtSecond: 1696583300},
 			},
-			1696583400,
-			false,
+			pulseTimeAtSecond: 1696583400,
+			syncDeletions:     true,
+			shouldSkipVolume:  false,
 		},
+		{
+			name: "different delete counts with syncDeletions disabled should be skipped if file counts match",
+			a: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+				FileCount:        1000,
+				DeleteCount:      100,
+				ModifiedAtSecond: 1696583300},
+			},
+			b: VolumeReplica{nil, &master_pb.VolumeInformationMessage{
+				FileCount:        1000,
+				DeleteCount:      101,
+				ModifiedAtSecond: 1696583300},
+			},
+			pulseTimeAtSecond: 1696583400,
+			syncDeletions:     false,
+			shouldSkipVolume:  true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			vcd := &volumeCheckDisk{
+				writer:        &buf,
+				now:           time.Unix(tt.pulseTimeAtSecond, 0),
+				verbose:       false, // reduce noise in tests
+				syncDeletions: tt.syncDeletions,
+			}
+			result := vcd.shouldSkipVolume(&tt.a, &tt.b)
+			if result != tt.shouldSkipVolume {
+				t.Errorf("shouldSkipVolume() = %v, want %v\nFileCount A=%d B=%d, DeleteCount A=%d B=%d",
+					result, tt.shouldSkipVolume,
+					tt.a.info.FileCount, tt.b.info.FileCount,
+					tt.a.info.DeleteCount, tt.b.info.DeleteCount)
+			}
+		})
+	}
+}
+
+// TestVolumeCheckDiskHelperMethods tests the helper methods on volumeCheckDisk
+func TestVolumeCheckDiskHelperMethods(t *testing.T) {
+	var buf bytes.Buffer
+	vcd := &volumeCheckDisk{
+		writer:  &buf,
+		verbose: true,
 	}
-	for num, tt := range tests {
-		vcd := &volumeCheckDisk{
-			writer:        os.Stdout,
-			now:           time.Unix(tt.pulseTimeAtSecond, 0),
-			verbose:       true,
-			syncDeletions: true,
+
+	// Test write method
+	vcd.write("test %s\n", "message")
+	if buf.String() != "test message\n" {
+		t.Errorf("write() output = %q, want %q", buf.String(), "test message\n")
+	}
+
+	// Test writeVerbose with verbose=true
+	buf.Reset()
+	vcd.writeVerbose("verbose %d\n", 123)
+	if buf.String() != "verbose 123\n" {
+		t.Errorf("writeVerbose() with verbose=true output = %q, want %q", buf.String(), "verbose 123\n")
+	}
+
+	// Test writeVerbose with verbose=false
+	buf.Reset()
+	vcd.verbose = false
+	vcd.writeVerbose("should not appear\n")
+	if buf.String() != "" {
+		t.Errorf("writeVerbose() with verbose=false output = %q, want empty", buf.String())
+	}
+}
+
+// TestWritableReplicaFiltering tests that read-only volumes are properly filtered
+func TestWritableReplicaFiltering(t *testing.T) {
+	replicas := []*VolumeReplica{
+		{nil, &master_pb.VolumeInformationMessage{Id: 1, FileCount: 100, ReadOnly: false}},
+		{nil, &master_pb.VolumeInformationMessage{Id: 2, FileCount: 200, ReadOnly: true}},
+		{nil, &master_pb.VolumeInformationMessage{Id: 3, FileCount: 150, ReadOnly: false}},
+	}
+
+	var writableReplicas []*VolumeReplica
+	for _, replica := range replicas {
+		if !replica.info.ReadOnly {
+			writableReplicas = append(writableReplicas, replica)
 		}
-		if isShould := vcd.shouldSkipVolume(&tt.a, &tt.b); isShould != tt.shouldSkipVolume {
-			t.Fatalf("result of should skip volume is unexpected for %d test", num)
+	}
+
+	if len(writableReplicas) != 2 {
+		t.Errorf("Expected 2 writable replicas, got %d", len(writableReplicas))
+	}
+
+	// Verify read-only replica was filtered out
+	for _, replica := range writableReplicas {
+		if replica.info.ReadOnly {
+			t.Errorf("Found read-only replica %d in writable replicas", replica.info.Id)
 		}
 	}
 }