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How to Resize BootCamp Partition without Deleting it on my Mac computer?

I'm trying to resize (expand) a Bootcamp partition. WinClone used to do this, but no longer. I tried Stellar Partition Manager, but it does not recognize the Bootcamp partition. I'm looking for a clear-cut way to do this safely. Yes, I have backups of the Bootcamp Windows portion, via WinClone. Thanks. --Rich

Mac Pro, macOS 10.13

Posted on Jun 4, 2019 1:50 PM

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Posted on Jun 7, 2019 8:28 AM

Thanks, John, for your feedback. You are completely correct about Boot Camp Assistant. (In addition, Boot Camp Assistant also requires the Windows Installation ISO image, which I did not have handy.) I did not find any means to expand the Bootcamp drive in situ. I also tried Stellar Partition Manager, but it did not even recognize the existing Bootcamp drive, and I'm still waiting for a refund. I did see elsewhere online that others found that Paragon's CampTune did not work for them, so I did not attempt to use it.


I ultimately used Winclone to back up the Bootcamp drive to my external RAID, then I deleted the Bootcamp Drive from within the APFS container on my (recently backed up) startup drive. I made a new ExFat drive at the new, larger size, then used WinClone to copy my block-based backup onto the new, larger NTSF formatted drive. A re-boot of each, and the new disk appears as a Bootcamp drive in the Finder and Disk Utilities and everything works fine. It was just a little unnerving to delete the existing Bootcamp drive without complete confidence that I could re-build it. I did test the backup Winclone drive first.


It seems the game has changed since Apple switched to the APFS volume structure with MacOS 10.13. There is a comment in Wikipedia on this, as follows:


https://en.wikipedia.org/wiki/Apple_File_System

Despite the ubiquity of APFS volumes in today's Macs and the format's 2016 introduction, third party repair utilities continue to have notable limitations in supporting APFS volumes, due to Apple's delayed release of complete documentation. According to Alsoft, the maker of the popular DiskWarrior, Apple's 2018 release of finalized APFS format documentation will enable safe rebuilding of APFS disks in future versions of its flagship product.[28] Competing products, including as MicroMat's TechTool and Prosoft's Drive Genius are expected to increase APFS support as well.


Again, I really appreciate your feedback. This was a vexing problem, and most of the information available online relates to expanding Bootcamp drives in situ prior to the introduction of APFS volumes.


--Rich

5 replies
Question marked as Best reply

Jun 7, 2019 8:28 AM in response to John Lockwood

Thanks, John, for your feedback. You are completely correct about Boot Camp Assistant. (In addition, Boot Camp Assistant also requires the Windows Installation ISO image, which I did not have handy.) I did not find any means to expand the Bootcamp drive in situ. I also tried Stellar Partition Manager, but it did not even recognize the existing Bootcamp drive, and I'm still waiting for a refund. I did see elsewhere online that others found that Paragon's CampTune did not work for them, so I did not attempt to use it.


I ultimately used Winclone to back up the Bootcamp drive to my external RAID, then I deleted the Bootcamp Drive from within the APFS container on my (recently backed up) startup drive. I made a new ExFat drive at the new, larger size, then used WinClone to copy my block-based backup onto the new, larger NTSF formatted drive. A re-boot of each, and the new disk appears as a Bootcamp drive in the Finder and Disk Utilities and everything works fine. It was just a little unnerving to delete the existing Bootcamp drive without complete confidence that I could re-build it. I did test the backup Winclone drive first.


It seems the game has changed since Apple switched to the APFS volume structure with MacOS 10.13. There is a comment in Wikipedia on this, as follows:


https://en.wikipedia.org/wiki/Apple_File_System

Despite the ubiquity of APFS volumes in today's Macs and the format's 2016 introduction, third party repair utilities continue to have notable limitations in supporting APFS volumes, due to Apple's delayed release of complete documentation. According to Alsoft, the maker of the popular DiskWarrior, Apple's 2018 release of finalized APFS format documentation will enable safe rebuilding of APFS disks in future versions of its flagship product.[28] Competing products, including as MicroMat's TechTool and Prosoft's Drive Genius are expected to increase APFS support as well.


Again, I really appreciate your feedback. This was a vexing problem, and most of the information available online relates to expanding Bootcamp drives in situ prior to the introduction of APFS volumes.


--Rich

Jun 7, 2019 5:14 AM in response to RichWagner

WinClone should be able to do this but it might not do it the way you want.


I have used WinClone to backup an existing smaller Boot Camp partition on one Mac and then restore it on a larger new Mac with a larger Boot Camp partition. Normally it would restore as the same size as the original but WinClone does let you expand during the restore.


What it does not do is do this in situ. You could of course use WinClone to backup and restore to the same Mac but restore to a bigger partition.


To do it in situ you need a different tool called CampTune. See - https://www.paragon-software.com/home/camptune/


Note: Boot Camp Assistant would also not do what you want. It can only change the size by completely deleting the existing one and then creating a new differently sized one.

How to Resize BootCamp Partition without Deleting it on my Mac computer?

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