I have Norton Security installed in many comps at my place including laptops and PCs. I noticed that the SDSDefs folder as shown in the attached screen print in PDF format retains many folders and uses up space on HDD. They cannot be deleted too. Symantec/Norton has to do something about it. The Screen Shot from the computer, which is attached, has the fresh/new installation. Even the VirusDefs folder is created but empty in this new installation. This started happening after the SDSDefs system was implemented. This new installation is only few days old. I have the same problem in the other computers too, but I can't send the screen shot as they are not accessible at present by me as they are out of residence at present.
I would like to mention to points here:
1. All Systems Win10 with all the updates installed to the latest and fast Startup disabled.
2. BootTime Protection Set to Aggressive in all computers.
AND I would like to mention that all computers are full shut down at end of the day.