Need to Increase Windows 8.1 Bootcamp Partition

Please re-post in the Boot Camp forum. This is a general iMac forum where most users don't use MS Windows or Boot Camp. The Boot Camp forum is where the experts are more likely to be.

Good luck.

The Bootcamp makes a partition, could be you'd need to modify the partition with it. I know that you can remove a partition in Bootcamp and that works, when trying to do so and free up that drive space with OS X doesn't always do the desired result when that outcome is needed.

You may need to look into the portion of the Fusion drive where you have the Windows/Bootcamp partition to see if there is enough room; that is increasingly hard to tell because there is a ton of stuff in "Other." And most of it would be for the Mac OS X. This may be on the SSD portion of the drive, not the HDD section.

When you create a partition in OS X, that is usually what you'd use to change it. But with Bootcamp, that makes it a different matter. There may be a way to use Disk Utility, but you may have to hope for a better answer that won't erase what you have; unless you have made a good backup clone just in case it gets out of hand.

If you do use Disk Utility from the OS X Utilities on the recovery portion of the drive, it may really go-to-town and mess up stuff. But that is at a different level than the Disk Utility in the running OS X.

There is a third-party utility I'd read about that can resize a Windows partition in a Mac without erasing it first; says it is Mavericks-ready. A post I saw it in was last years w/ an older OS X question... says under $20.

Check how to resize a Windows volume without erasing the volume, w/ Paragon Camptune X: http://www.paragon-software.com/downloads/camptune.html

And then, there is iPartition: http://www.coriolis-systems.com/iPartition.php

Maybe this will help. Just be sure you have a backup.

Good luck & happy computing! 🙂

Re-sizing any partition after using Bootcamp is risky (in fact it isn't supported at all by Apple).

Camptune X has been rumoured to work though it toasted my system.

Safest way is to backup Windows, remove Windows via Bootcamp then re-create Windows partition with Bootcamp in the new size. Then you can restore your backup.

Do both

Backup Windows and OSX then use CampTune X, if it fails erase your hard drive and start over from your backups.

CampTune usually works just fine.

You can't do that if there is a Boot Camp partition, or if you removed one using Disk Utility.