I'm getting this error with bootcamp "The startup disk does not have enough space to be partitioned"

How large a Windows partition are you trying make with only 22 GBs of free space? You don't have enough free space for OS X. Creating a Windows partition would not be advisable until you either remove 50 GBs of stuff from your hard drive or install a larger drive.

Boot Camp must be able to allocate a contiguous block of space on the drive. If it cannot find 10 GBs of contiguous space, then you cannot create the Windows partition.

You will have to backup your OS X partition to an external drive, boot from the external drive, use Disk Utility to repartition and reformat your hard drive back to a single volume, then restore your backup to the internal hard drive.

1. Get an empty external hard drive and clone your internal drive to the external one.
2. Boot from the external hard drive.
3. Erase the internal hard drive.
4. Restore the external clone to the internal hard drive.

Clone the internal drive to the external drive

1. Open Disk Utility from the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Check the box labeled Erase destination.
5. Select the destination volume from the left side list and drag it to the Destination entry field.
6. Select the source volume from the left side list and drag it to the Source entry field.
7. Double-check you got it right, then click on the Restore button.

Destination means the external backup drive. Source means the internal startup drive.

Restart the computer and after the chime press and hold down the OPTION key until the boot manager appears. Select the icon for the external drive and click on the downward pointing arrow button.

After startup do the following:

Erase internal hard drive

1. Open Disk Utility in your Utilities folder.
2. After DU loads select your internal hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed. Do not quit Disk Utility.

Restore the clone to the internal hard drive

1. Select the destination volume from the left side list.
2. Click on the Restore tab in the DU main window.
3. Check the box labeled Erase destination.
4. Select the destination volume from the left side list and drag it to the Destination entry field.
5. Select the source volume from the left side list and drag it to the Source entry field.
6. Double-check you got it right, then click on the Restore button.

Destination means the internal hard drive. Source means the external startup drive.

Note that the Source and Destination drives are swapped for this last procedure.

What is the error message reported by Boot Camp Assistant? The problem may be a need to clone using Carbon Copy Cloner 3.5.1 in file copy mode. Disk Utility is now doing block copies which does not fix the problem. CCC should resolve the problem.

I am working on a re-write of the procedure using CCC, although I have not seen any complaints about the older method not working until you reported it.

CCC has excellent included documentation. Just select a Source for the left side and a Destination on the right. Volumes are selected from dropdown menus. That's pretty much it for basic cloning.

HAHA,

I just deleted more space from 25 to 35 free gigs, and now it works. I had the same exact error as you. Looks like the boot camp installer meant to say 35 free gigs rather than 10. Glad i checked your post first before trying to do CCC again and all that crap.

I was able to fix same issue by running disk utility and repairing MacintoshHD. First had to verify disk, then was instructed to restart, holding down command and r, and then repairing disk in disk utility. Worked like a charm after that.

Using disk utility create a partition bigger than what it is asking for, then delete that partition and extend the original back to full size again. worked for me, nothing else i tried worked, fresh install was not an option so tried repairing and full defrag, no joy. After 8 hours of trying i had an idea and creating and deleting a partition worked spot on.