@m.higgins can you try and erase the drive using Disk Utility first. Then try partitioning the drive in Disk Utility to make sure you can partition it. Sometimes Core Storage volumes can be difficult to partition.

I can partition the drive in disk utility just fine, I also used terminal to erase the core storage so it is no longer a core storage volume

I just keep getting this over and over

What version of Casper Imaging are you using? I would think that if you've removed the core storage volume and you are still not able to partition the drive then there must be something wrong with Casper Imaging.

I'm having the same issues if that matters.

I have been trying to split my drive with Casper Imaging into HFS and NTFS, Casper Imaging 9.72 gave me that error. I haven't tried 9.73 yet.

Edit:

Just tested 9.73 and it also failed.

A script might be needed.

Edit 2: Script works fine.

Set to 'Before' in your imaging config.

diskutil partitiondisk disk0 2 GPTFormat JHFS+ MacintoshHD 500G MS-DOS WINDOWS 400G

Updated my post

I will give this a go and let you know what happens!

Still not having any luck. The problem seems to be that unless i tick erase target drive then I can't install windows. As soon as I tick it, it tries to re-partiton the drive even after the script has run!

Ignore that, got it working!

Thanks for the help @Abdiaziz

@Abdiaziz Is this a known bug then? What's the script doing that Casper Imaging isn't?

@dferrara

I don't know if it's a known bug or not, I haven't checked into that.

As for the other part, Casper Imaging isn't partitioning the disk at all. It gives the error "Unable to create partition on disk0s2". So a script is needed to partition it (one of OS X, other for Windows).

@Abdiaziz Thanks, I'll have to look into that. It's just annoying since partitioning is one of Casper Imaging's core functions (setting those variables in the GUI). I'm on 9.65.

@dferrara

I'm working on a script that merges a partitioned disk back into one, but I've ran into a lot of issues.

If anyone has any idea on how to merge the disk back into one "Macintosh HD", please share it!

@m.higgins @Abdiaziz I just fixed this by changing the Windows partition name to "WINDOWS" instead of "Windows" in Casper Admin, with the lowercase. Apparently, any lowercase letters will throw an error that the name isn't supported by the MS-DOS filesystem.

Hey @dferrara, do you know of a way to wipe a dual boot drive back into one?

Example:

Partiton 1: Macintosh HD

Partition 2: WINDOWS

--

What I want is just Macintosh HD. I been using this script, set to "before" and it just fails.

diskutil eraseDisk JHFS+ MacintoshHD disk0

@Abdiaziz Try this, it should destroy both partitions and leave Macintosh HD as a new JHFS+ volume.

diskutil mergePartitions JHFS+ [force] Macintosh HD WINDOWS