How to clean a drive completely without any software or quick format option.?

I was having problem regarding storage amount shown in my 16GB pen drive as 2.2MB only. Means it wasnt cleaned completely. So i found the following DOS commands to clean the drive you want. It worked beautifully and now, problem is solved.

• Open cmd and type DISKPART.
• A new promt box will get open and then start typing the following commands.

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DISKPART> list disk

Disk ### Status Size Free Dyn Gpt 
-------- ------------- ------- ------- --- --- 
Disk 0 Online 298 GB 0 B 
Disk 1 Online 7509 MB 6619 MB

DISKPART> select disk 1

Disk 1 is now the selected disk.

DISKPART> clean

DiskPart succeeded in cleaning the disk.

DISKPART> create partition primary

DiskPart succeeded in creating the specified partition.

DISKPART> exit