You must create two disk partitions on the SD card.
必须在sd卡上创建两个磁盘分区。
Each metadevice is built from slices in the actual physical disk partitions.
每个metadevice都是由实际的物理磁盘分区中的片构成的。
The main difficulty is that low-level management of disk partitions risks system integrity, if anything goes wrong.
主要困难在于，如果任何事情发生错误，那么磁盘分区的低级管理将危及系统完整性。
Logical volumes are the LVM equivalent of physical disks partitions-for all practical purposes, they are physical disk partitions.
LVM中的逻辑卷就相当于物理磁盘分区；在实际使用中，它们就是物理磁盘分区。
LVM allows admins to manage their storage resources with much greater flexibly than the traditional method of using static disk partitions.
lvm使管理员可以用更加灵活的方式来管理其存储资源，这要比用静态磁盘分区这种传统方式灵活得多。
Be careful when altering disk partitions, as it is possible to lose your data if you delete or change the wrong partition.
当要更改磁盘分区时请务必小心！因为您删除或者改变一个错误的分区可能使您丢失数据。
The concept behind Software RAID is simple — it allows you to combine two or more block devices (usually disk partitions) into a single RAID device.
软件RAID的概念很简单——使您可以将两个或多个块设备(通常是磁盘分区)组合为单个RAID设备。
In this case, more expensive high capacity hardware is used for the fast traffic while the bulk traffic is handled by commodity hardware with large disk partitions.
在此情况下，将对快速流量使用较昂贵的高容量硬件，而批量流量则由具有大型磁盘分区的普通硬件来处理。
On small systems (like a desktop at home), instead of having to guess how big a partition needs to be, LVM allows you to resize your disk partitions easily as needed.
在小型系统中，LVM允许按照需求简单的重新分配分区大小，从而不用去估量一个分区可能需要多大。
Note that SCSI drives are designated sd, while IDE drives are hd. This command displays the existing disk partitions; be sure to use values appropriate for your system.
注意，SCSI硬盘被指定为sd，而IDE硬盘是hd。
Partitions are containers that consist of contiguous sectors on the disk; partitions are defined by simple data structures.
分区是由磁盘上相邻扇区组成的容器，分区是由简单数据结构定义的。
Partitions are containers that consist of contiguous sectors on the disk; partitions are defined by simple data structures.
分区是由磁盘上相邻扇区组成的容器，分区是由简单数据结构定义的。
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