defraggler zero fill in Defraggler Posted November 24, 2019 I don't use Defraggler so I don't know what options it has but don't you mean CCleaner? Whatever s/w it is the process of writing a file and then deleting it is totally different from erasing a NAND flash block. The SSD's grabage collection routines will erase the (invalid) block irrespective of what has been written there previously. And don't bother to zero or anthing fill an SSD. Windows will not allow you to access TRIMed data, and the block erasure will remove anything that was written before permanently, so a normal delete will do.