c93e1e46_Idle_Time___2010___January__Mac_OS_X
[iPhone] Because the iPhone doesn’t allow background processes, it’s the only app running, with only a few built-in, light-on-file-system-access exceptions (the heaviest of which is probably Mail). [Mac OS X] 
Any number of applications may be running, and they may be accessing files on the same volume you’re browsing.
Idle Time » 2010 » January
Mac OS X