I cant install windows via Bootcamp because I get an error. Help?

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Every time I try to install windows with Boot Camp assistant, I get the error:
The startup disk cannot be partitioned or restored to a single partition.
The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.

I looked at my Disk Utility and I only have one partition. I tried something out in terminal which lets you see hidden partitions and I saw that I had a second partition labeled EFI but that shouldn't be affecting Boot Camp Assistant right?

Anyways does anybody know how to fix this I really want to run windows natively on my macbook.

MacBook Air, OS X Mavericks (10.9.5)
 

chscag

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The error is deceiving. What it's really telling you is that your hard drive is fragmented and there is not enough continuous free space to create a partition for Boot Camp.

And by the way, your hard drive has three partitions on it already: EFI, Macintosh HD, and Recovery. OK, how to solve this?

Make a Time Machine backup (full) of your Macintosh HD. Boot to your Recovery partition (command + r), erase and format your Macintosh HD, reinstall Mavericks, restore your Time Machine backup. The fragmentation will be removed and you can then proceed to install Boot Camp and Windows.
 
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Can I use a tool like iDefrag to defrag my harddrive? I don't know ow to make a backup of my hd and even if I did I dont any external hd to back it up to
 

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iDefrag should get the job done and let you avoid that error. Even so, I strongly recommend following member chscag's advice and make a backup first. If there is any kind of hiccup during the defrag process your drive may become so scrambled that the data can't be recovered easily if at all.

Time Machine is very easy to use when making a backup. See here for example.
 

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iDefrag should get the job done and let you avoid that error. Even so, I strongly recommend following member chscag's advice and make a backup first. If there is any kind of hiccup during the defrag process your drive may become so scrambled that the data can't be recovered easily if at all.

Time Machine is very easy to use when making a backup. See here for example.
 
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Just did a full dfrag of my harddrive with iDefrag. Took about 3-4 hours and still get the same error in BCA. Does that mean that not having enough continuous free space is not the problem?
 

chscag

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That's why I don't recommend using iDefrag (I have a copy) because the results are not always satisfactory. How large is your hard drive and how much space is free? If you're tight on free space iDefrag will not work. Also, there are different options to choose from when you defrag.
 

chscag

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I have a 120gb ssd and I have about 40gb free. I chose the full defrag option

Your SSD is too small and tight on space. You can not effectively create a Boot Camp partition on that drive even if you use the minimum. Your best bet is to use Windows in a virtual machine with VM software. That way you don't have to mess with Boot Camp.

VirtualBox from Oracle is free and very easy to setup and install Windows. Unless you intend to run graphic games in Windows it should work well.
 
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Having used both VirtualBox and VMWare Fusion I would recommend Fusion if you can afford it
VirtualBox is great for free but harder to set up and a bit buggy.
 
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defrag doesn't work let me explain this in more detail you need to reinstall mac os x with a fresh formatted hard drive the reason is if the hard drive has been dual partitioned at any point and time then the partition removed and restored back to a single you cannot create another partition because mac os x won't let you because it will corrupt the o.s
 

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John:

Skip the confusing statements. SSDs should NEVER be defragmented. If the OP had mentioned he had a SSD, no one here would have recommended iDefrag.
 
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I have a couple of friends who have the same exact laptop as I do (literally same model) and they dont get that same error when opening BCA. I noticed that they all have around 60gb or more of free space tho so maybe thats it? Im not sure.
 

chscag

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No doubt. Your friends have more space to work with. As long as you're that tight on space it's best not to attempt to install Boot Camp. Your model MacBook Air may be able to be updated with a larger SSD from OWC (Mac Sales). (Depending on which model you have.) Go to their web site and see if you can replace your SSD with a larger one and how much it would cost.
 

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