Your CD has errors. It maybe the outcome of corrupt download or bad CD base

为何光盘安装linux时出现错误，刻录成光盘成MD5校验无错误，刻录后用CDRcheck比较原文件也无误，但在安装时报错了，大致信息是：
Your CD has errors. It maybe the outcome of corrupt download or bad CD base.
这怎么回事呢？