If you're like me, and you don't use hybernation, you turn it off. Only, in Windows 7, it doesn't delete the hyberfil.sys, which can be quite large, depending on your memory.

Well, I found this easy guide to get rid of it:

http://www.kombitz.com/2009/05/06/how-to-disable-hibernation-and-delete-hiberfilsys-file-in-windows-7/