Peter, the Pagefile.sys is your Virtual Memory cache file and is best left on your SSD and set to automatic, this way windows can change the size as needed. The reason you want to keep this on your SSD is because it offers you the best read and write performance of any other HDD in your system. Pagefile.sys should never be disabled or set to anything less then 4GB, because there are some services that use this over physical memory such as your ram. The hibernate is not as critical and can be disabled, especially if your on a desktop and never hibernate your system, but on a laptop you would want to leave this enabled because it's used frequently.
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