分区挂载失败—修复fatab文件

　　删除分区后却不记得修改fstab ，或fstab 被破坏了，都会导致不能进入系统，提示如下：　　fsck.ext3: No such file or directory while trying to open /dev/hda*　　*** An error occurred during the file system check.　　*** Dropping you to a shell ; t