root@armbian:/ddbr/install# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 511M 0 part /boot
└─sda2 8:2 0 931G 0 part /var/log.hdd

                                   /

mmcblk2 179:0 0 7.2G 0 disk
└─mmcblk2p2 179:2 0 6.6G 0 part
mmcblk2boot0 179:32 0 4M 1 disk
mmcblk2boot1 179:64 0 4M 1 disk
zram0 253:0 0 868M 0 disk [SWAP]
zram1 253:1 0 50M 0 disk /var/log
zram2 253:2 0 0B 0 disk
root@armbian:/ddbr/install#
格式化为EXT4
sudo mkfs.ext4 /dev/mmcblk2p2

sudo mkdir /ddbr/install

你应该看到一个空的目录

ls /ddbr/install
sudo mount /dev/mmcblk2p2 /ddbr/install
ls /ddbr/install

完成后卸载它

sudo umount /ddbr/install