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。

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Chief among these is the limitation of four primary partitions.

主要困难是4个主分区的限制。

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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

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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

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