Create a 100Mb file for testing transfer speeds

Written by Sam McGeown
Published on 18/7/2008 - Read in about 1 min (151 words)

We have a Bonded ADSL solution for our servers to provide the necessary upstream transfer speeds for the applications we host. We have bonded ADSL because our exchange still doesn’t support SDSL, and a leased line is overkill. Theoretically, we should have 28.1 Mbps download and 3.2Mbps upload - what I am actually seeing is about 1.7Mbps down and 1.9Mbps up. I have tested this on various servers, over various times and file sizes, there is no doubt that the performance is POOR.

Anyway, on to my point. I wanted to create a file that was exactly 100MB to test transfer speeds. Windows XP, Vista, 2003 and 2008 all have a command line utility called FSUTIL.exe which has a subset of commands to manipulate files, with which you can create a file that is exactly 100MB…like so:


Usage: FSUTIL FILE CREATENEW [Filename] [Size in bytes]


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