System Preferences > Notifications > TechTool Pro 8... Why ? It seems that it activates the APSD on the computer even if I don't use TechTool Pro 8. I only accept activities on the computer with applications I use, I have not much memory, so less there is activities on the computer, more I have memories for applications I use. Other reason too. Thank you for your interest !

You can use the Notifications preferences to exclude TechTool Pro. Please see the text and the screen captures in:

TechTool's frequent notifications of Recovery HD mount & dismount.