为您的硬盘分区仅仅指的是将您的硬盘空间切分成几块。分区之后，每一块都是独立于其余部分的单独空间。这和在一个大房子里砌几堵墙有几分相似，如果您在其中一间房间里安置家具，那么这不会对其它房间有任何影响。

If you already have an operating system on your system which uses the whole disk and you want to stick Debian on the same disk, you will need to repartition it. Debian requires its own hard disk partitions. It cannot be installed on Windows or Mac OS X partitions. It may be able to share some partitions with other Unix systems, but that's not covered here. At the very least you will need a dedicated partition for the Debian root filesystem.

You can find information about your current partition setup by using a partitioning tool for your current operating system. Partitioning tools always provide a way to show existing partitions without making changes.

通常情况下，改动一个已经建立文件系统的分区，会导致其中的数据信息遭到损毁。因而，您应当在重新分区之前总是先做一下备份。继续拿房子作比喻，在移动墙壁时，您最好在把挡路的家具都移开，否则就要冒家具被毁坏的危险。

Several modern operating systems offer the ability to move and resize certain existing partitions without destroying their contents. This allows making space for additional partitions without losing existing data. Even though this works quite well in most cases, making changes to the partitioning of a disk is an inherently dangerous action and should only be done after having made a full backup of all data.