Reference
https://blog.atwork.at/post/Create-a-test-file-with-specific-size
Using the fsutil command line tool
fsutil file createnew .\10mb-testfile.txt 10485760
The file size is passed in bytes:
- 1 MB: 1024*1024=1048576
- 10MB: 1024*1024*10=10485760
- 100MB: 1024*1024*100=104857600
- 1GB: 1024*1024*1024=1073741824