很少有什么事情比你的电脑硬盘遇到问题更让人沮丧，但是有没有一种分区方案比基于MBR的更好呢？今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者Clay Nichols想知道GPT分区是否比基于MBR的分区更不容易损坏：

I know that GPT (GUID Partition Table) partitioning has some benefits over MBR (Master Boot Record), including support for:

• More partiti*** (128)
• Hard drives larger than 2TB

Are there any other benefits like less potential for corruption or are you just playing whack-a-mole where GPT can also  become corrupted in the same way as MBR? The two hard drive failures I have experienced were due to corrupted MBRs.

与基于MBR的分区相比，GPT分区更不容易损坏吗？

答案

超级用户贡献者mtak为我们提供了答案：

According to the Wikipedia article on GUID Partition Tables, there is redundancy built into the GPT partition scheme. The GPT header is written at the beginning as well as at the end of the disk (see graphic below). In addition, the partition table header also contains a CRC32 checksum for itself and for the partition table.

The redundancy is not available in the MBR partition scheme, which only occupies the first 512 bytes of a disk. The extra redundancy would allow for more resilience against corruption. The CRC32 checksum allows the system to detect which of the two headers is the correct, uncorrupted one if a problem arises so that it can be used to repair the other one.

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图片来源：Kbolino的GUID分区表方案（Wikipedia）