How to Generate File of a determinate Size in Windows?

How is the Best and fastest way to do it?

From stackoverflow

• I found this Page, I try it and work great.

  To create One File use

  fsutil file createnew filename filesize
  

  To create a lote of Files use

  or /L %i in (1,1,25000) do fsutil file createnew A%i.tmp 12288
  

  will create 25,000 files of 12288 bytes (12KB) named A1.tmp, A2.tmp, A3,tmp…

• PowerShell:

  $f = new-object System.IO.FileStream c:\temp\test.dat, Create, ReadWrite
  $f.SetLength(42MB)
  $f.Close()
  

  This will create a file c:\temp\test.dat that consists of 42MB of nullbytes. You can of course just give byte count instead as well. (42MB = 42 * 1048576 for PowerShell)

• c:>fsutil file createnew /? Usage : fsutil file createnew Eg : fsutil file createnew C:\testfile.txt 1000