How To Create Specifically Sized Files in Windows 7, 8.1 & 10

When you’re testing the speed of your home network or the read/write speeds of your hard drive, it’s useful to have sized files like 1MB, 10MB, 100MB and so on. Trying to create these precise files yourself is nigh on impossible. Instead, you could use a little-known Command Prompt trick to make them for you.

Steps required to create a specific sized file in windows 10.

Step 01: First, open a File Explorer window (Windows key +E) and navigate to the folder where you want your files to be saved.


Step 02: In the next step, right-click in the address bar, type cmd.exe, then press Enter. A Command Prompt window set to the same folder will now appear.

Step 03: Now type fsutil file createnew, followed by the name you want to give your file and it's size.

For example, we want to create a 100MB file to test the upload and download speeds of various online storage providers. 


Step04: The size needs to be entered in bytes like 1MB is equal to 1,048,576 bytes, so for a 100MB file, we need it to be 104,857,600 bytes. You, therefore, have to type fsutil file createnew 100MB.tst 10487600.



Note that we’ve given our filename a dummy extension of ‘.tst’ and left the commas out of the file size at the end.

The new file will be created with the name 100MB.tst, measuring precisely 100MB.

Related Post:
-->How To Shut Down a Computer after a set period of time. 
-->How To Make Space for Windows 10 Updates.

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