How to disable Fast Start in Windows 8

• Navigate to the key HKEY_LOCAL_MACHINESYSTEMControlSet001ControlSession ManagerPower
  
• Locate the key HiberbootEnabled and double-click on it
  
• Set the value of the key to 0 to deactivate fast boot
  
• To restore the setting at a later time, change it back to 1.
  
• Navigate to the key HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSession ManagerPower
  
• Locate HiberbootEnabled there and double-click the entry
  
• Change the value of the key to 0 to deactivate Fast Boot.
  
• To restore the key to its original value at a later time, set it back to 1
  

Windows 8 from the next restart on will no longer use Fast Boot when the system is shut down. Again, I’d only recommend to turn fast boot off if you are noticing issues with check disk during startup. If you are dual booting Windows 7 and 8 for instance, and not noticing any issues, then it is not recommended to turn the feature off.