Disk usage

The device system is linux ubuntu20. When a USB flash drive or TF card is inserted, the storage device will also be identified as a node similar to /dev/sdb1 or /dev/mmcblkp1, which is the same as in the desktop PC Linux environment.

If a USB flash drive is inserted normally, it will be automatically mounted to the /media/usb-sd* directory. You can use df -h the command to check whether it is mounted:

    linaro@bm1684:~$ df -h
    Filesystem      Size  Used Avail Use% Mounted on
    overlay         5.9G  788M  4.8G  14% /
    devtmpfs        3.4G     0  3.4G   0% /dev
    tmpfs           3.4G     0  3.4G   0% /dev/shm
    tmpfs           692M  1.8M  690M   1% /run
    tmpfs           5.0M     0  5.0M   0% /run/lock
    tmpfs           3.4G     0  3.4G   0% /sys/fs/cgroup
    /dev/mmcblk0p1  128M   65M   64M  51% /boot
    /dev/mmcblk0p7   44G  300K   42G   1% /data
    /dev/mmcblk0p4  2.4G  2.3G     0 100% /media/root-ro
    /dev/mmcblk0p5  5.9G  788M  4.8G  14% /media/root-rw
    /dev/mmcblk0p6  2.0G  159M  1.7G   9% /opt
    /dev/mmcblk0p2  2.9G   53M  2.8G   2% /recovery
    tmpfs           692M     0  692M   0% /run/user/1000
    /dev/sda         30G   80K   30G   1% /media/usb-sda

If it is not mounted automatically, such as when a TF card is inserted, you can use sudo fdisk -lthe command to view the corresponding node:

    linaro@bm1684:~$ sudo fdisk -l
    ...
    Disk /dev/sda: 29.3 GiB, 31457280000 bytes, 61440000 sectors
    Disk model: U330
    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: 0x00000000


    Disk /dev/mmcblk1: 29.74 GiB, 31914983424 bytes, 62333952 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: 0x00000000

    Device         Boot Start      End  Sectors  Size Id Type
    /dev/mmcblk1p1       8192 62333951 62325760 29.7G  c W95 FAT32 (LBA)

You can see that the TF card node is /dev/mmcblk0p1 , and you can use mount /dev/mmcblk0p1 /mnt the command to mount it to the /mnt directory.

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