diff --git a/backend.py b/backend.py
index af5a285..2c00a49 100644
--- a/backend.py
+++ b/backend.py
@@ -2027,7 +2027,7 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
             with open(grubenv_path, 'w') as f:
                 f.write("# GRUB Environment Block\n")
                 f.write("saved_entry=\n")
-                f.write("#" * 1024 + "\n")
+                f.write("#" * 4096 + "\n")
             log_success(f"✓ 创建 grubenv: {grubenv_path}")
         except Exception as e:
             log_warning(f"创建 grubenv 失败: {e}")
@@ -2380,7 +2380,7 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
                         log_info(f"✓ 创建目录: {target_dir}")
                     
                     # 创建目标文件（1024 字节的 GRUB 环境块）
-                    grubenv_content = "# GRUB Environment Block\nsaved_entry=\n" + "#" * 1024 + "\n"
+                    grubenv_content = "# GRUB Environment Block\nsaved_entry=\n" + "#" * 4096 + "\n"
                     with open(target_path, 'w') as f:
                         f.write(grubenv_content)
                     log_success(f"✓ 创建符号链接目标文件: {target_path}")
@@ -2400,7 +2400,7 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
                 
                 # 方法: 使用 echo 和 tee 在 chroot 内创建文件
                 grubenv_chroot_path = grubenv_dir_in_chroot + "/grubenv"
-                grubenv_content = "# GRUB Environment Block\nsaved_entry=\n" + "#" * 1024 + "\n"
+                grubenv_content = "# GRUB Environment Block\nsaved_entry=\n" + "#" * 4096 + "\n"
                 
                 # 使用 printf 创建文件（更可靠）
                 success, _, stderr = run_command(