information in memory can't moved hard disk, must stay in ram. amount of wired memory depends on applications using.
active memory
information in memory, , has been used.
inactive memory
information in memory not actively being used, used.
example, if you've been using mail , quit it, ram mail using marked inactive memory. inactive memory available use application, free memory. however, if open mail before inactive memory used different application, mail open quicker because inactive memory converted active memory, instead of loading mail slower hard disk.
used
total amount of memory used.
download menumeters if want keep eye on ram. when first boot 11" air using 600mb
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