diff --git a/services/web_panel/utils/system_info.py b/services/web_panel/utils/system_info.py
index ae16f87..d654c1e 100644
--- a/services/web_panel/utils/system_info.py
+++ b/services/web_panel/utils/system_info.py
@@ -154,8 +154,12 @@ class SystemInfoCollector:
                         continue
                     try:
                         usage = self.psutil.disk_usage(p.mountpoint)
+                        # Windows: 用盘符作为设备名 (C:, D:)
+                        dev = p.device
+                        if os.name == 'nt':
+                            dev = p.mountpoint.rstrip('\\')  # C:\ → C:
                         parts.append({
-                            "device": p.device,
+                            "device": dev,
                             "mount": p.mountpoint,
                             "fstype": p.fstype or "",
                             "total_gb": round(usage.total / 1073741824, 1),
@@ -163,8 +167,11 @@ class SystemInfoCollector:
                             "percent": usage.percent,
                         })
                     except (PermissionError, OSError):
+                        dev = p.device
+                        if os.name == 'nt':
+                            dev = p.mountpoint.rstrip('\\')
                         parts.append({
-                            "device": p.device,
+                            "device": dev,
                             "mount": p.mountpoint,
                             "fstype": p.fstype or "",
                             "total_gb": 0, "used_gb": 0, "percent": 0,