This limits the number of primary partitions on a disk to four.
这限制了一个磁盘上的主分区数量，最多为4个。
Chief among these is the limitation of four primary partitions.
主要困难是4个主分区的限制。
When the operation is done, your microSD card contains two primary partitions
操作完成后，您的microSD 卡有两个主分区
You are allowed four primary partitions, any of which can be extended partitions.
您可以使用4个主分区，每个都可以成为扩展分区。
The disk used in the earlier examples has three primary partitions, all formatted for Linux use.
上面的示例中使用的磁盘具有三个主分区，均格式化为供linux使用。
Following the code area, the MBR stores data on four partitions, known as primary partitions.
在这个代码区域之后，MBR存储数据在4个分区上，这些分区称为主分区。
To get more partitions one of the primary partitions can be turned into an extended parititon.
如果想要获得更多的分区，主分区中的一个可以被转换为扩展分区。
The MBR contains a table of four entries that are used for what is known as Primary Partitions.
MBR包含一张表，表内有四个项，用以记录各个分区信息。
Unfortunately, many of the operating systems that require primary partitions are unable to boot from GPT disks.
遗憾的是，许多需要主分区的操作系统都不能从GPT磁盘引导。
When more than four partitions are required, as is often the case, one of the primary partitions must instead become an extended partition.
如果需要4个以上的主分区(往往需要4个以上的主分区)，其中一个主分区就必须以扩展分区的形式出现。
Note that primary partitions are numbered from 1 to 4, and the numbering system may contain gaps, whereas logical partitions are numbered from 5 up and may not contain gaps.
注意主分区是从1到4进行编号的，编号系统可能有间隙，但是逻辑分区是从5开始编号的，不存在间隙。
This limitation is due to something called the Master Boot Record which tells the computer which partitions it can boot from, and so primary partitions are usually reserved for operating systems.
这个只跟硬盘有关，跟操作系统是什么没有关系。主引导记录告诉机器从哪里启动系统，所以一般来说主分区是安装系统的。
This is, however, an ugly workaround that creates its own problems, such as difficulties installing multiple operating systems when too many of them want too many primary partitions to themselves.
然而，这是一种笨拙的权宜之计，会导致一些问题。比如，安装多个操作系统时，如果过多的操作系统要求自身拥有过多的主分区，就会出现困难。
Leverage partitions and Primary Indexes in filters and prompts.
在过滤器与提示信息中利用分区和主索引。
For instance, you can't shrink certain file systems, and you may need to carefully plan the positioning of primary versus logical partitions in your new layout.
例如，您不能缩小某个文件系统，以及您需要在新的布局中周密计划主分区与逻辑分区的配置。
If you want to take space from a logical partition to give it to a primary partition or vice versa, you must explicitly resize the extended partition that surrounds the logical partitions.
如果您想要从逻辑分区腾出空间给主分区，您必须显式地调整围绕逻辑分区的扩展分区，反之一样。
While there are tons of file system types, there are only three kinds of partitions: primary, extended, and logical.
虽然文件系统很多种，但分区类型只有三种：主分区，扩展分区，逻辑分区，其中逻辑分区是在扩展分区中的。
Some notes: if you need to create more than four partitions, remember to toggle the "Primary partition" option after creating your boot volume.
一些注意事项：如果需要创建的分区多于四个，那么请记住在创建引导卷之后切换掉“PrimaryPartition”选项。
PC people are generally well-acquainted with tools such as fdisk, which are used to create and delete primary and extended partitions on hard disks.
使用PC的人通常相当了解fdisk这样的在硬盘上创建和删除主要分区和扩展分区的工具。
If you need more than four partitions, give away one primary partition to create an extended partition.
如果需要超过4个分区，就需要放弃一个主分区来创建一个扩展分区。
Thus, if you add a primary partition, it's possible that no partition Numbers will change; but if you add a logical partition, all your other logical partitions' Numbers may change.
因此，如果您添加一个主分区，分区编号也有可能不会改变，但是如果您要添加一个逻辑分区，您所有的其他逻辑分区变化都会改变。
For example, to balance the load between the two paging VIOS partitions you can set the primary and secondary paging VIOS individually for each partition.
例如，为了在两个分页VIOS分区之间平衡负载，可以为每个分区分别设置主和从分页VIOS。
A primary or a secondary OS/400 partition may "host" one or more Linux partitions, or the OS/400 partition may be used simply for initial installation of a non-hosted Linux partition on iSeries.
一个主OS/400分区或者二级 OS/400 分区可以“托管（host）”一个或多个Linux分区， 或者 OS/400 分区可能只是用来在 iSeries 上初始化未托管的Linxu 分区的安装。
A primary or a secondary OS/400 partition may "host" one or more Linux partitions, or the OS/400 partition may be used simply for initial installation of a non-hosted Linux partition on iSeries.
一个主OS/400分区或者二级 OS/400 分区可以“托管（host）”一个或多个Linux分区， 或者 OS/400 分区可能只是用来在 iSeries 上初始化未托管的Linxu 分区的安装。
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