如果您担心格式化硬盘后数据会被恢复，您需要使用像DBAN一样强大的选项，还是使用功能较弱的选项？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。

图片由马特邓洛普（Flickr）提供。

问题

超级用户读者cantsay想知道为什么格式化后可以恢复数据：

If a quick format just marks bits as writable and a normal format writes zeroes to the entire disk, why do people bother with DBAN and why are multiple passes ever required?

为什么格式化后可以恢复数据？

答案

超级用户贡献者Alex McKenzie为我们提供了答案：

It used to be possible by reading the residual magneti** left by the previous bits. This is not so much of an issue now that the tracks and bits that hard-drives write are so **all. It is almost impossible to recover any meaningful data off of a zeroed drive with modern disks.

This next section is only true for Windows XP (as Psycogeek pointed out, Vista and later Windows systems do zero out the hard-drive if you do a full format).

That being said, your definiti*** of quick format and normal format are off. A normal format does not zero out the disk, that would take too long. The difference between the two is that a normal format looks for bad sectors on a drive while a quick format does not.

So it is best to use a tool like DBAN to do at least one pass if you want to make sure data is not recoverable. And if you are doing one pass, then why not do a few more just for fun?

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