sdnf.exe is part of a product called known as Windows Disk Defragmenter and the developer is Microsoft Corp. and Executive Software International, Inc. .
If you think that this file contains a virus or another malware, please download a virus scanner.
If sdnf.exe is using too much CPU or too much memory in your system, it is possible that your file has been infected with a virus. Installing an antivirus is recommended.
Not all processes can be uninstalled without the help of a 3rd party tool, especially malware. To see if it can be uninstalled, first go to Start > Control Panel > Add/Remove programs and select Windows Disk Defragmenter from the list to remove the process sdnf.exe from your computer.
If you have any problems with sdnf.exe, you may try using a registry cleaner or a speed-up software to check, analyze, and fix problems that are affecting the performance of your computer.
You may try contacting Microsoft Corp. and Executive Software International, Inc., the developer of sdnf.exe and ask for more information.