How to clean data by written dd's /dev/random

What does "disk full" have to do with "written by dd's /dev/random"? Why would someone write data from /dev/random to a file system? Is this a troll post? If it isn't, there is a lot of explaining needed.
 
dd if=/dev/random of=somefile would certainly fill up your disk. But then you just remove that somefile that was created and it'll all be gone again.
 
Well thank you , i was trying to fde with geli then i made a mistake but now everything is okay. I formatted my harddisk with encryption.
 
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