After creating a Windows Boot Camp partition on a Mac, you might eventually run out of space and want to make it larger. Here’s how to do it without reinstalling Windows. ***Remember to back up first, because a mistake here could erase all data on your machine!***<\/b><\/p>\n
Step 1.<\/b> By default, newer versions of OS X have System Integrity Protection, an anti-malware feature that doesn’t let you perform certain modifications to your partitions. Reboot to your Recovery Partition, start the Terminal, and type: Step 2.<\/b> In OS X, shrink the size of your Mac boot partition using the Disk Utility GUI, and reboot.<\/p>\n Step 3.<\/b> OS X will automatically format the new unused space as HFS+, and we want this space available for Windows, so go to the Terminal and type: Step 4.<\/b> Right now your Windows partition will be temporarily rendered unbootable. To fix it, while still in OS X, download and install the gdisk utility<\/a>.<\/p>\n Step 5.<\/b> Type: Step 6.<\/b> ***If you get any error messages at this point, stop!***<\/b> Otherwise, carefully enter the following (adapted from this<\/a> forum thread): Step 7.<\/b> If this went according to plan, you should see two partitions: one type EE and one 07, with the 07 entry marked with * under Boot. If this is what you see, apply the changes by typing: Step 8.<\/b> Now reboot into Windows and install the free version of Partition Wizard<\/a>.<\/p>\n Step 9.<\/b> Click on your Windows partition, click Expand Partition, and choose the unallocated space you erased in Step 3. <\/p>\n Step 10.<\/b> Click apply and then restart Windows to complete the changes. You should now see the new space added to your Windows partition.<\/p>\n Step 11.<\/b> Optional final step, reenable OS X SIP. Boot to your Recovery Partition, start the Terminal, and type:
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\ncsrutil disable
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\ndiskutil list
\n<\/code>
\nFind the partition you want to erase—probably disk0s4, but double-check that the size is correct—and then type:
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\nsudo diskutil eraseVolume Free\\ Space null disk0s4
\n<\/code><\/p>\n
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\nsudo gdisk \/dev\/disk0
\n<\/code><\/p>\n
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\nr <enter> go to the recovery & transformation menu
\nh <enter> create a new hybrid MBR
\n5 <enter> add partion 5 to the MBR
\ny <enter> set up EFI boot
\n<enter> accept the default MBR hex code of 07
\ny <enter> set the bootable flag
\nn <enter> do not protects more partitions
\no <enter> review (but don't apply) the changes
\n<\/code><\/p>\n
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\nw <enter> write partition table to disk
\n<\/code><\/p>\n
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\ncsrutil enable
\n<\/code><\/p>\n