create a large size empty file to measure transfer speed

OS :
Windows

open cmd

fsutil file createnew file_name 1073741824        // 1GB

fsutil file createnew file_name 1048576        // 1MB

fsutil file createnew file_name 1024        // 1KB

fsutil file createnew file_name 1        // 1B

Reference:
https://www.foolegg.com/how-to-create-a-empty-file-of-a-specific-size-in-windows/