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Difference between Available and Used in Info for MacIntosh HD and Space Free and Space Utilised under Activity Monitor, Disk Usage?

I have a MacBook Air 2010, upgraded to OSX Version 10.8.4. When I click the Macintosh HD and then look under Info, it says I have 120.47GB capacity, Available 60.97GB, Used 59.5GB. However when I look under Activity Monitor, Disk Usage it says Space Utilised 92.18GB, Space free: 28.29GB. Questions:


Why the difference?


Which is more important for computer speed?


How to I reduce "Space Utlised" to closer to "Used"? (I've already moved 25GB of the more bulky, less immediate data to external storage from the computer, including emptying IPhoto Trash and the main Trash. The Space Utilised dropped only from 95GB to 92GB--while the Used space dropped from 85GB to 60GB.)

MacBook Air, OS X Mountain Lion (10.8.4), MacBook 2010 version, upgraded to 1

Posted on Aug 14, 2013 5:15 AM

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10 replies

Aug 14, 2013 5:26 AM in response to gabrowntravel

Open  > About this Mac > More Info > Storage. If you see a "Backups" category in your internal disk, tell us how much space it takes.


If you have Time Machine turned on, it creates local snapshots in your internal drive > http://pondini.org/TM/30.html They are detected as free space in some apps like Finder, and as used by other applications like Disk Utility.


There's no need to turn them off, as Time Machine deletes them automatically when the hard drive gets full. If you want to delete them, turn off and on Time Machine

Aug 14, 2013 7:32 AM in response to mende1

Mendes


Sorry, but I missed the "storage" tab at the top when I first did it. I've gone in as you recommended, and it shows 32.5GB of backups. So you were absolutely right. That's the problem.


Now how do I turn off and turn on Time Machine to erase these GBs? When I click the Time Machine icon, there is just the full screen of pages of backups receding into the background, but no bar at the top with the various icons which would allow me to quit the application.


Please advise.

Aug 14, 2013 8:11 AM in response to iheartapple1970

Iheartapple1970


Just to let you I tried the reindexing before the Mendes advice and it had no effect. Of course, I may have done it wrong. It was the HD icon from the desktop which I dragged into the Privacy window of Spotlight (and then did the +, OK, - and close Spotlight). Should I have dragged in something else? Or opened up the HD and dragged in all the contents?


Also, there is a small section in my HD which is for my wife's account which has a separate user name and password, although it has no data in it and I set it up while under my administrator account original, so my MacAir may think I still "own" it; in any case, I did not get any sort of error message saying I did not have ownership of the entire HD.

Difference between Available and Used in Info for MacIntosh HD and Space Free and Space Utilised under Activity Monitor, Disk Usage?

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