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With that in place my Win7 + hiberfil + pagefile + apps is in the 30-40GB range.
Good reminder. If you don't hibernate your computer, turn off hibernation and hybrid sleep to get rid of the hiberfil and save yourself a couple of gigs.
Even if you do hibernate you should turn off hybrid sleep with an SSD. Hybrid sleep mode will always write the hiberfile, even if you only told the PC to sleep. If you use sleep this is a lot of extra writes to the SSD. I have sleep and hibernate both enabled but hybrid sleep disabled and it only writes the hiberfile when going into hibernate.
Another tip is to get enough RAM for what you need to do and make your pagefile as small as possible. Even Microsoft's suggestions for sizing a pagefile haven't really been updated. Win7 might be better, but older versions would simply use a fixed multiplier of your RAM as the size, but you actually don't need as big a pagefile if you have more RAM. Unless you use a program that specifically requires a lot of pagefile space, you can probably drop this down to 1GB or less, possibly even disabling it. Check out the How Big Should I Make the Paging File? section of http://blogs.technet.com/b/markrussinovich/archive/2008/11/17/3155406.aspx.
While most people can't afford enough SSD to hold all their files and therefore need to compromise, keep in mind that everything you move off your SSD is losing that speed advantage. You don't need to store your downloaded ISOs on the SSD, but moving your entire profile to HDD means that all those little temp files and such are now being accessed at HDD speeds rather than SSD (and those are the small random files where SSDs are best and HDDs are worst).
I think when I tried just disabling Hybrid sleep, it didn't remove the hibernate file itself, and it was only after I disabled hibernate that I got rid of it. Either way - good point.
I never claimed that disabling Hybrid Sleep would remove the hiberfile - that wasn't my intention at all.
I'll state it again:
Hybrid Sleep means that every time the computer sleeps (not hibernates) it ALSO writes the hiberfile "just in case" there's a power failure. I have sleep and hibernate both enabled and actively used on my system depending on the circumstances. With hybrid sleep enabled every time you put it into S1/S3 sleep it will also write the RAM-sized (4GB in my case) hiberfile even if you have no intention of using it. On an HDD that's just an annoying delay before entering sleep. On an SSD that's an extra upto 4GB of writes (or more) whenever the PC goes to sleep.
With hybrid sleep disabled, hibernation may still be enabled and used (and the hiberfile will still exist) but it is NOT written when you use S1/S3 sleep. It is only written when hibernate is activated.