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My hard disk is starting to get a bit cramped, with only 30GB available. I'm about download Lion and I'd like to know if I'll need to free up some space before I install it.

Also, I've read that Lion creates a hidden partition with a bare-bones copy of OS X for emergency system recovery. How large is it? How much space will I lose after installing Lion?

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up vote 4 down vote accepted

According to http://www.apple.com/support/lion/installrecovery/ you only need 7G of free space.

Amazingly small amount of space considering the download is 3.6G itself.

Many are reporting gaining back between 5 and 10 GB of space as Lion is more compact than Snow Leopard.

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You should be fine with 30GB of space. Lion will take about 4 GB on your hard drive (plus the installer - which is automatically deleted afterwards) and it makes a 650MB recovery partition, which you can remove manually, if you so desire.

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Will Lion take an extra 4 GB beyond a Snow Leopard install? Or will it remove ??? GB of Snow Leopard stuff and replace it with 4 GB? –  hotpaw2 Jul 20 '11 at 19:17
    
@Hotpaw2 - I'm guessing that it removes the old files, since the OS is, by itself complete. (You can use the same installer on a DVD or USB drive to do a fresh install.) –  Moshe Jul 20 '11 at 19:59
    
Just to note, I saw a post somewhere online about this, but I can't seem to find it... –  Moshe Jul 20 '11 at 20:07
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