Hi guys, So I am back to posting, almost after a week.Hope you guys like it.
This is a trick to create a blank file from your pc of any specific size without any software just follow these steps

*. Goto run(win key+r) and type there cmd and hit enter 

*. or open c>windows> and right click on cmd and clickrun as administrator 

*. in command prompt type

*. fsutil(space)file(space)createnew(space)name of drive:name of file.extention(space)size example

*. fsutil file createnew e:temptempfile.txt 10000000

where 10000000 is file size in bytes and e: is the name of drive where you want to create the file after writing this hit enter and the file will be created in the root directory of that drive of the size you entered

to change the extension rename the file and change ,txt to.jpeg,.avi or leave the extension blank to create an unknown file 

note:keep the drive in which you are creating the file opened in background while creating the file.

Hope you Unterstood 
Enjoy^_^