How to Format a Bootable USB Drive Without Software

Step 1: Formating Pen drive via DiskPart [ Windows]

Connect the pen drive which needs to be formatted to a system running Windows Operating System.
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STEP 1 : open Run using the key combination ( Win key + R ).
STEP 2 : type cmd .To open Command Prompt.
STEP 3 : type diskpart . Run the Pop-up window that appears .
. This opens DiskPart.
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STEP 4 : type list disk .
. This will list all the memory storage devices connected to the PC.
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STEP 5 : type select disk 1 .
. Usually disk 1 if no other storage devices are connected .
. The number specifies the drive to be formatted.
. drive 0 will be your internal hard disk. Identify and select your disk correctly.
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STEP 6 : type clean. This wipes data off your pen drive.
STEP 7 : type create partition primary . This will format the pen drive as FAT.
STEP 8 : now go to My Computer or This PC (as it is listed nowadays) .
Format the pen drive by Right clicking on it and selecting Format option.
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This will restore back your pen drive to its usual condition.

1. Insert your USB flash drive to your running computer. As the first step, we need to run Command Prompt as administrator. To do this, we need to find cmd by typing 'cmd' in the search box on Windows Start Menu. After search result for 'cmd' appears, right click on it and select "Run as administrator".
2. Type 'diskpart' on Command Prompt (without quotes) and hit Enter. Wait for a while until the DISKPART program run.
3. Type 'list disk' to view active disks on your computer and hit Enter. There would be seen that the active disks shown as Disk 0 for hard drive and Disk 1 for your USB flashdrive with its total capacity.
4. Type 'select disk 1' to determine that disk 1 would be processed in the next step then hit Enter.
5. Type 'clean' and hit Enter to remove all of data in the drive.
6. Type 'create partition primary' and hit Enter. Creating a primary partition and further recognized by Windows as 'partition 1'.
7. Type 'select partition 1' an hit Enter. Choosing the 'partition 1' for setting up it as an active partition.
8. Type 'active' and hit Enter. Activating current partition.
9. Type 'format fs=ntfs quick' and hit Enter. Formatting current partition as NTFS file system quickly.
10. Type 'exit' and hit Enter. Leaving DISKPART program but don't close the Command Prompt instead. We would still need it for next process.