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I'm trying to partition my Macbook Air's SSD for dual-boot with Boot Camp (which I've done several times before)... however, it's not seeing 10GB free, yet I have 20.56GB free as per Finder, and Disk Utility sees 10.9GB unused space.

What's going on? How can I force this to work? Can I use disk utility and image to an external drive and restore? Would vastly prefer an easier method of course

For space issues, there are a few things you can try:

  • Begin by restarting your computer as a first step. This sometimes resolves issues.
  • For Time Machine users on Lion, space may being consumed by Time Machine local snapshots, which can be disabled.
  • Search with Finder to see if the space is being consumed by a very large file or several large files. Adjust the 50GB in the illustration to whatever size you deem appropriate.

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  • Use OmniDiskSweeperJDisk Report or GrandPerspective to see how space is being used on your drive. Some of these apps may show more detail than others, so try several.
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Download a copy of Carbon Copy Cloner, use it to make a bootable clone on one of your external drives. Reboot to the clone, using disk utility erase the drive, using Carbon Copy restore the clone.

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You may be just reading the wrong figure in Disk Utility, have a look at the quote below from the apple discussion forumsDisk Utility will show two different "free" readings, depending on where you look.Sounds odd, but they're for different purposes. The larger figure, which the Finder and other things will use, is the total free space available.The second is the amount of free space available for a new partition. It's shown when you select the top line for the drive, click the Partition tab, then select a partition, the "Available" amount may be smaller.This is because partitions, unlike folders, must occupy contiguous space on a disk. The data on your OSX partition is scattered over it, not all nicely packed together. That's normal, as you add, update, and delete files, not every nook and cranny is used again immediately.But whether there's 7 GB free or 18, that probably isn't enough to be adding a partition; it's probably too little for OSX to operate well. There's no "hard and fast" rule, but you should always have at least 10 GB or 10% of your OSX drive free; many folks say 15% or more.You could back up your drive (on two different HDs, to be safe), reformat it to 2 parttions, then restore the backup. But it's going to be very tight, and you'll likely have performance problems because of it.Try to delete anything you don't need, and/or offload stuff you don't use often and delete it.

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