Cannot Partition 3TB Internal Drive for Bootcamp

Question

I have read a number of threads and tried a number of things from various websites to get my iMac to use Bootcamp, but no luck. It was so easy with my MacBook Pro. :^/
The basic problem is that when I start with a single, internal 3TB drive with a brand, new clean install of Yosemite, I get the message:
The startup disk cannot be partitioned or restored to a single partition.
The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.
To get past this I go into Disk Utility and resize the partition from 3TB to 2TB. This allows me to get past this screen and have Boot Camp partition the drive. Note that it shows the drive as 2TB and I divide it equally with 1TB for Mac and 1TB for Windows.
In the Windows installer the first thing you notice is that there are five partitions, and that the Windows partition is 1.8 TB, it having grabbed the empty space for itself. It complains that it cannot use the partition as it uses the GPT Partition Style, so I click the Format option to have it format as NTFS. But it still complains that it cannot use the partition because of its style.
Going back into the Mac OS and using Disk Utility, I try and reformat the partition to ExFAT and it starts to, but fails indicating that it is not supported for Core Storage.
I have been through this cycle several times now. I thought the issue previously was because of an older version of OS X. I then upgraded and found the same issue. So in order to change the partition style I finally wiped the drive using Disk Utility from a bootable USB and reinstalled Yosemite cleanly.
If I missed a step or option somewhere I am willing to wipe the drive again. I just need to know what to change. Here is the current state of my drive:
> diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Internal                1.0 TB     disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:          Apple_CoreStorage                         2.0 TB     disk0s4
   5:                 Apple_Boot Boot OS X               134.2 MB   disk0s5
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *7.8 GB     disk1
   1:                 DOS_FAT_32 WININSTALL              7.8 GB     disk1s1
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            GSP1RMCPRXFRER_EN_DVD  *3.3 GB     disk2
> sudo gpt -vv -r show /dev/disk0
gpt show: /dev/disk0: mediasize=3000592982016; sectorsize=512; blocks=5860533168
gpt show: /dev/disk0: PMBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 5860533167
       start        size  index  contents
           0           1         PMBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6        
          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640  1954418960      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  1954828600     1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  1956098136        1960        
  1956100096  3904170888      4  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
  5860270984      262144      5  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  5860533128           7        
  5860533135          32         Sec GPT table
  5860533167           1         Sec GPT header
>
sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 97451/255/63 [1565565872 sectors]
Signature: 0xAA55
         Starting       Ending
#: id  cyl  hd sec -  cyl  hd sec [     start -       size]
1: EE 1023 254  63 - 1023 254  63 [         1 - 4294967294] <Unknown ID>
2: 00    0   0   0 -    0   0   0 [         0 -          0] unused     
3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     
4: 00    0   0   0 -    0   0   0 [         0 -          0] unused     
Any help that can be offered would be greatly appreciated. Thanks in advance.
Dale

Answer 1

This is an example if the partitions are
GPT1 = MBR1 = EFI
GPT2 = MBR2 = OSX
GPT3 = MBR3 = Recovery HD
GPT4 = MBR4 = BOOTCAMP.
You will need to pick the correct order based on how you format the 3TB disk. Any GPT entry beyond the 2TB address will not be a part of the MBR.
Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 6. Accept all other defaults that Gdisk offers.
Sudo gdisk /dev/disk0
P  (Print list of parts)
R   (Recover)
H (chooses Hybrid)
Partitions numbers to be hybridized: 2 3 4
Y (Good for GRUB question)
N (part 2 boot flag)
N (part 3 boot flag)
Y  (part 4 boot flag make NTFS bootable partition)
W  (Write the new MBR)
Y    (Yes! write the new MBR)
Reboot
Here is an example of the Q&A (when using partitions 2 3 4) ...
Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y
Creating entry for GPT partition #2 (MBR partition #2)
Enter an MBR hex code (default AF): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #3 (MBR partition #3)
Enter an MBR hex code (default AB): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #4 (MBR partition #4)
Enter an MBR hex code (default 07): 07
Set the bootable flag? (Y/N): Y