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1. 查看存储设备的信息

fdisk -l

显示如下：

Device         Boot  Start      End  Sectors  Size Id Type
/dev/mmcblk1p1        2048    43007    40960   20M 83 Linux
/dev/mmcblk1p2       43008   452607   409600  200M 83 Linux
/dev/mmcblk1p3      452608 14876671 14424064  6.9G 83 Linux


Disk /dev/mmcblk0: 3.7 GiB, 3965190144 bytes, 7744512 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x3bcb1b2b

Device         Boot Start     End Sectors  Size Id Type
/dev/mmcblk0p1       8192 7744511 7736320  3.7G  c W95 FAT32 (LBA)
/dev/mmcblk0p3      24897   24897       0    0B  0 Empty

2. 进入操作存储设备的操作界面，下面这个是个sd卡，这样可以直接操作整个卡，如果后面有p1,p2,p3则是代表的分区

fdisk /dev/mmcblk0

输出内容如下：

Welcome to fdisk (util-linux 2.31.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): 

3. 查看帮助m，输入m则为查看帮助

Command (m for help): m

Help:

  DOS (MBR)
   a   toggle a bootable flag
   b   edit nested BSD disklabel
   c   toggle the dos compatibility flag

  Generic
   d   delete a partition
   F   list free unpartitioned space
   l   list known partition types
   n   add a new partition
   p   print the partition table
   t   change a partition type
   v   verify the partition table
   i   print information about a partition

  Misc
   m   print this menu
   u   change display/entry units
   x   extra functionality (experts only)

  Script
   I   load disk layout from sfdisk script file
   O   dump disk layout to sfdisk script file

  Save & Exit
   w   write table to disk and exit
   q   quit without saving changes

  Create a new label
   g   create a new empty GPT partition table
   G   create a new empty SGI (IRIX) partition table
   o   create a new empty DOS partition table
   s   create a new empty Sun partition table

4. 删除分区d，需要删除那个分区就选择数字几

Command (m for help): d
Partition number (1,3, default 3): 1

Partition 1 has been deleted.

5. 新建分区n，一般直接建立主分区就行，就是利用p，扩展分区的话采用e

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-7744511, default 2048): 2048
Last sector, +sectors or +size{K,M,G,T,P} (2048-7744511, default 7744511): 43007

6.保存分区w

Command (m for help): w

The partition table has been altered.
Syncing disks.

7. 查看分区参数p

Command (m for help): p
Disk /dev/mmcblk0: 3.7 GiB, 3965190144 bytes, 7744512 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x3bcb1b2b

Device         Boot  Start     End Sectors  Size Id Type
/dev/mmcblk0p1        2048   43007   40960   20M 83 Linux
/dev/mmcblk0p2       43008  452607  409600  200M 83 Linux
/dev/mmcblk0p3      452608 7744511 7291904  3.5G 83 Linux

Command (m for help):