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<blockquote data-quote="MacInWin" data-source="post: 1558737">+1 for chas_m's comment. I think the free space required is more related to the kinds of applications you use. Most applications, as well as OSX itself, use disk space as &quot;scratch&quot; memory and put temporary files on it as you are doing work. That's how you can Cancel almost any edit, the application just goes back to the last version stored in that scratch memory. So if all you do is email, surf, chat, and you have a lot of internal RAM then you don't need a ton of free space on the hard drive, but if you routinely edit huge Photoshop files and keep lots of history layers, edit movies or huge audio files, etc, and routinely push the memory limits of your system, forcing OSX to swap out tons of data, then you need a LOT of disk space free.Personally, I start to get nervous when I have less than 100 GB free on my boot drive and look to remove stuff that isn't critical to other locations. At 50 GB I force myself to take that action before I do any Photoshop work at all.</blockquote>

[QUOTE="MacInWin, post: 1558737"] +1 for chas_m's comment. I think the free space required is more related to the kinds of applications you use. Most applications, as well as OSX itself, use disk space as "scratch" memory and put temporary files on it as you are doing work. That's how you can Cancel almost any edit, the application just goes back to the last version stored in that scratch memory. So if all you do is email, surf, chat, and you have a lot of internal RAM then you don't need a ton of free space on the hard drive, but if you routinely edit huge Photoshop files and keep lots of history layers, edit movies or huge audio files, etc, and routinely push the memory limits of your system, forcing OSX to swap out tons of data, then you need a LOT of disk space free. Personally, I start to get nervous when I have less than 100 GB free on my boot drive and look to remove stuff that isn't critical to other locations. At 50 GB I force myself to take that action before I do any Photoshop work at all. [/QUOTE]

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