Real sleepmode WITHOUT hibernation As the most people, I also googled after setting the hibernatemode, and found the following command:

sudo pmset -a hibernatemode 0


... which should enable the RAM-only sleep mode. I also deleted the sleep image, but the result is not that what I expect.

Hardware config:
Apple Mac mini


Intel i5 (GPU: HD4000) 
HDD: 500 GB (5400RPM)
RAM: 4GB


If I put my machine into sleep mode by choosing the Sleep Button after the power button is pressed. It goes into sleep mode in couple of second. OK. If I wake it up, it returns in couple of seconds. Still OK... BUT:


if I let my machine for some hours in sleep mode, it turns into hibernation, which is both unnecessary and slow with a HDD 5400RPM. And because of that if I turn on my machine, it takes about 1-2 minutes to come back.


How to turn out hibernation FULLY? - i really don't need power failure safety feature for a desktop configuration.
Try this:

#power management settings
pmset -g | grep hibernatemode

#remove forcefully
sudo rm -f /var/vm/sleepimage

#0 means normal sleep and is the default for desktops
sudo pmset -a hibernatemode 0   

#1 means hibernate mode and is the default for older portables (pre 2005)
sudo pmset hibernatemode 1 

#3 means safe sleep and is the default for portables made after 2005
sudo pmset hibernatemode 3  

#25 is the same as hibernate mode, but is the setting used for newer (post 2005) Mac portables
sudo pmset hibernatemode 25