diff --git a/admin/GlancesMonitor.py b/admin/GlancesMonitor.py
index 4f99794..aa9d51c 100644
--- a/admin/GlancesMonitor.py
+++ b/admin/GlancesMonitor.py
@@ -111,7 +111,7 @@ class GlancesMonitor:
                 for disk in disks:
                     read_bytes = disk.get('read_bytes', 0)
                     write_bytes = disk.get('write_bytes', 0)
-                    io_usage = (read_bytes + write_bytes) / (1024 * 1024)
+                    io_usage = (read_bytes + write_bytes) / (2048 * 1024)
                     max_io_usage = max(max_io_usage, io_usage)
                 if max_io_usage > self.io_threshold:
                     self.send_alert_email("磁盘 I/O（MB/s）", max_io_usage, self.io_threshold)