Create dummy files for testing your network throughput

When you’re performing a file server migration for example, it is very usefull to see what your everage network throughput is when you’re copying some files with robocopy or something. To create some testfiles or dummy files, you can use the tool FSUTIL.exe. This tool is default available in Windows 2003 and later. In my testlab I’ve created some testfiles. The size of an dummy file is calculated in bits, so to create a file of 1 GB or 5 GB looks like:

1024 * 1024 * 1024 * 1 or 5 (or another size in GB). So first you’ll get the Bits, then Bytes, then Mega Bytes, then Giga Bytes.
1 GB = 1073741824
5 GB =  5368709120

C:\Windows\System32\fsutil file createnew E:\Dummy\dummy_1GB.file 1073741824
C:\Windows\System32\fsutil file createnew E:\Dummy\dummy_5GB.file 5368709120


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