.CFD File Extension
NortonLifeLock Optimization File
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What is a CFD file?
LightningSand.cfd is a file created by certain NortonLifeLock cybersecurity programs released in the early 2010s. It is always located within a drive's System Volume Information folder. LightningSand.cfd is an unnecessary file that can cause your system to produce error messages. You should delete LightningSand.cfd if possible.
In the early 2010s, numerous NortonLifeLock users reported the existence of a file named LightningSand.cfd in their System Volume Information folders. Windows often reported that this file was corrupt, and that users should run CHKDSK to examine and delete LightningSand.cfd (and other CFD files).
In 2011, NortonLifeLock employee wesleyj informed users that LightningSand.cfd is "an internal Norton file used for optimizations." Wesleyj stated that removing the file should not cause any problems or data loss, and that users' NortonLifeLock programs would continue functioning normally. As such, you should delete LightningSand.cfd and any other Norton CFD files you encounter.
How to open a CFD file
NortonLifeLock CFD files are not meant to be opened. You should delete LightningSand.cfd and other Norton CFD files using CHKDSK. Norton CFD files are unnecessary, and their existence can cause Windows to produce error messages.