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How to format a USB flash drive?
How do I clear everything (data, viruses) from a thumbdrive?

How to format a pen drive in Ubuntu?
I have this pen drive which I made bootable using some other system (OS).
But I need to format it from my Ubuntu 12.04. Please guide me.

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Method #1 (The Graphical Way)

Open Disks program from dash:

enter image description here

Then choose your device from left. Make sure you have selected at least one volume, and click on format as below:

enter image description here


Method #2 (The Command-Line Way)

In case you can't get your device formatted from Method #1 try this way.

  1. Open the Terminal (Ctrl + Alt + T)

  2. List your block storage devices by issuing the command lsblk
    Then identify your pen drive by it's SIZE. In my case its /dev/sdb

    enter image description here

  3. Erase everything in the pen drive (OPTIONAL):

    sudo dd if=/dev/zero of=/dev/sdb bs=4k && sync  
    

    Replace /dev/sdb with your corresponding device. This will take some time. It will pretend to stuck. Just be patient.

  4. Make a new partition table in the device:

    sudo fdisk /dev/sdb
    
    • Then press letter o to create a new empty DOS partition table.
  5. Make a new partition:

    • Press letter n to add a new partition. You will be prompted for the size of the partition. Making a primary partition when prompted, if you are not sure.

    • Then press letter w to write table to disk and exit.

  6. Format your new partition.

    • See what is your new partition with a command lsblk
      In my case it is /dev/sdb1

    enter image description here

    • Issue the command below to format the new volume:

      sudo mkfs.vfat /dev/sdb1  
      

      Please replace /dev/sdb1 with your corresponding device.

    • Eject the device:

       sudo eject /dev/sdb
      
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  • @Naveen Dude, what theme/version of ubuntu are you using(I know it is irrelevant question, but I liked it).. – Bharat Soni Jan 2 '15 at 9:32
  • @BharatSoni: gnome-look.org/content/show.php/… – Naveen Jan 8 '15 at 13:04
  • Why is the formatting process when done via the terminal window so damn slow (the USB stick I'm using is only 8 GB in size)? I've been sitting here for well over 10 minutes now and it's is still not finished. Why is that? Am I doing something wrong? – misha Mar 20 '16 at 8:14
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    Coming back here in 2020 and it still works :) Thanks ! Also patient part is way too long in my slow laptop – Shashank Sep 5 '20 at 9:58
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You can try the application called Disks Utility. It's a very handy utility which should let you format the disk, among other things. You can find it by pressing ALT + F2 and typing the name, or going to System > Administration, or I guess typing the name in unity dash.

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