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“Available Memory” in Task Manager

 

The “Available Memory” counter in Task Manager is actually the sum of the following three internal memory lists:

  • The Standby list.
  • The Free list.
  • The Zero list.

Available Bytes is the amount of physical memory available to processes

running on the computer, in bytes. It is calculated by summing space on
the Zeroed, Free, and Standby memory lists. Free memory is ready for
use; Zeroed memory is pages of memory filled with zeros to prevent later
processes from seeing data used by a previous process. Standby memory is
memory removed from a process’s working set (its physical memory) on
route to disk, but is still available to be recalled.

ref:

http://support.microsoft.com/kb/312628

http://support.microsoft.com/kb/184063

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