Example of formatting a USB flash drive to FAT32 in linux

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You can see the hard disk + USB flash disk in your computer. For example:

Filesystem 1K-blocks Used Available Use % Mounted on
Udev 4023248 0 4023248 0%/dev
Tmpfs 808520 9784 798736 2%/run
/Dev/sda3 46860948 21381896 23075608 49%/
Tmpfs 4042584 50936 3991648 2%/dev/shm
Tmpfs 5120 4 5116 1%/run/lock
Tmpfs 4042584 0 4042584 0%/sys/fs/cgroup
/Dev/sdb6 144154576 50051096 86757752 37%/workspace
Tmpfs 808520 44 808476 1%/run/user/1000
/Dev/sdd 1448208 4 1448204 1%/media/siwei/5FF1-57D4
The above/dev/sdd is a USB flash disk.

Then unmount it:

$ Unmount/dev/sdd

Finally, you can format it:

$ Mkfs. vfat/dev/sdd