Installed windows 10 via bootcamp on my MBP running macOS Sierra, but I'd like to expand the Windows partition and shrink the macOS partition, avoiding a reinstall if possible. I did a search already, but the other questions I've found on this topic are 1) about windows 7 and 2) just suggest using WinClone or similar. How would this be done manually without the use of paid utilities?

Edit: I've used gParted from an ubuntu live USB to resize the windows partition. The only issue now is that windows throws an error on boot.

Welcome to Reddit's community for users, developers, and hackers of Mac OS X – the computer operating system from Apple! Please share your tips, tricks, hacks, creations, and humor related to the best desktop environment out there. Resizing a Mac Drive Partition with Disk Utility. It is recommended to back up the drive before modifying the partition table, do that before beginning.

Online sources suggest using gdisk to somehow sync the GPT and MBR tables? (I have data backups and mac OS boots fine, so now it's just a matter of curiosity and avoiding a reinstall if possible). Don’t ever touch the partitioning from Windows! No Windows app can figure out how it is being ‘fooled’ into thinking it’s in charge.

There are only 2 apps that won’t simply break Boot Camp completely, Paragon Hard Disk Manager & TwoCanoes WinClone. Afaik, neither can yet handle APFS. Carbon Copy Cloner can safely back up HFS & Boot Camp partitions, but cannot by itself recreate them, you must complete the underlying formatting first.

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Apple’s own Disk Utility will not allow you to even attempt this. The Apple-recommend method is to completely remove Boot Camp & start over with a bigger partition size.

Indeed, it is a valid point. I've been on the other side of the table, having to work with people who either dont want to spend much money or they did the previous mistake and it is me who has to repair it by hand, thats why I allways try to find the non-conventional way. I've screwed many disks, but I only lost information once because dd didn't copy the disk properly but didnt throw a warning. Since then I allways check manually if backups are done correctly and never made a client lose a single bit. Btw: removed the downvote and gave you a +1, considering possible mistakes from future users – Nov 21 '17 at 19:57. You have to use a partition utility like GParted.

If you are using APFS as filesystem GParted cannot modify it. You'll have to find a tool able to do so, and do the resize in parts, first the physycal APFS partition and then the Windows NTFS. If there's no software which automatically does it it involves a VERY HIGH RISK of data loss. Keep this in mind and backup your data (or whole disk) before. If you want to try the 'easy way' first follow this guide about. It will only work properly if the NTFS partition of the Windows installation is a proper NTFS partition. Keep in mind that BEFORE doing this you'll have to shrink your mac partition using mac's Disk Utility.

It will not allow you to make the bootcamp bigger, but it will make room for you to enlarge it with MiniTool (or any other tool capable of working NTFS under the partition layout your HDD has). The full procedure is explained: Yesterday expanded my bootcamp partition from 50 up to 100 Gb using Mini Tool Partition Wizard Home Edition, a Freeware Windows Program after seeing this video: Note that I have OSX Mavericks, Steps are: 1) backup all your files (optional but strongly reccomended).

2) Using OSX Disk Utility resize MacintoshHD partition leaving unallocated space as much as you need to add to bootcamp partition. 3) Set Bootcamp as Boot Disk and restart the mac. 4) in Bootcamp with Windows running launch Mini Tool Partition and select the bootcamp partition. 5) Choose 'expand' option in order to expand the partition using all the unallocated space. 6) The program prompt to you to restart the mac for apply the task, cause is not possible while the partition is mounted and windows running. 7) Restart the mac and then automatically Mini Tool Partition will do the job in a 'graphic msdos like' form. Now the long way around: First of all, before doing anything MAKE A BACKUP OF YOUR HARD DISK.

For zero risks use dd (diskdupe) to backup every single bit of the harddisk into a disk image. You can check how to do so.

Fosters home for imaginary friends mac daddy. If you dont want to risk to reinstall everything from scratch make sure your backup contains the partition table and the partitions, or that you are totally able to restore that backup, even if you bought a new hard disk. This is a critical step if you're not confortable with partition modification (its recomended even if you are). Whenever you touch a partition you are risking your data, and even though most times there will be a way to recover your info even if you screw it up without a backup, there are chances you'll overwrite important data and loose it forever. The risk depends on the operation performed and resizing is a particularly risky operation!