Formatting a USB Memory Stick
You can partition and format a Linux filesystem on a USB data stick using the following sequence of commands. First, you need to identify which device is your USB stick - the easiest way is probably to remove it if it is plugged in and then reconnect it. This will generate some messages about the device in the system messages file. View the last few lines to identify your device.
Your device will be named something like sda1, sdd1, etc. The next step is to create a partition on the stick.
sudo fdisk /dev/device-name
Now, create a filesystem using mkfs.
sudo mkfs -t vfat /dev/device-name
Now you need to create a folder as a mount point for the device.
Finally, you can now connect the device to its mount point:
sudo mount /dev/device-name mount-point