diff --git a/api/nodes/disk_writer.proto b/api/nodes/disk_writer.proto
index 08a4b2d..f754567 100644
--- a/api/nodes/disk_writer.proto
+++ b/api/nodes/disk_writer.proto
@@ -4,6 +4,7 @@ package synapse;
 
 message DiskWriterConfig {
   string filename = 1;
+  uint32 storage_device_id = 2;
 }
 
 message DiskWriterStatus {
diff --git a/api/status.proto b/api/status.proto
index 3a73793..9400c34 100644
--- a/api/status.proto
+++ b/api/status.proto
@@ -23,9 +23,16 @@ enum DeviceState {
   kError = 4;
 }
 
+message StorageDevice {
+  string name = 1;
+  uint32 storage_device_id = 2;
+  float total_gb = 3;
+  float used_gb = 4;
+}
+
 message DeviceStorage {
-  float total_gb = 1;
-  float used_gb = 2;
+  reserved 1, 2;
+  repeated StorageDevice storage_devices = 3;
 }
 
 message DevicePower {