linux 下的主分区

# 示例命令（使用fdisk）
sudo fdisk /dev/sda

# 创建扩展分区
Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): e
Partition number (1-4, default 1): 1
First sector (2048-20971519, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): 

# 创建逻辑分区
Command (m for help): n
Partition type:
   p   primary (1 primary, 1 extended, 3 free)
   l   logical (numbered from 5)
Select (default p): l
Adding logical partition 5
First sector (34-20971519, default 34): 
Using default value 34
Last sector, +sectors or +size{K,M,G} (34-20971519, default 20971519): 

# 保存并退出
Command (m for help): w

sudo fdisk -l

lsblk