Q: 2015 iMac Boot Camp not working giving "We couldn't create a new partition error..."

Additional information listed below.

Sorry that was a typo. The correct information is below. I have tried the install with only the boot USB installed. I haven't tried resetting the SMC and NVRAM yet. I'll try that now. Though does the information below help with any more information?

Also upon setting the partition numbers for hybridization (i only set a boot flag for part 4) it did tell me it couldn't write the thing in gdisk because it couldn't read rdisk1. Don't know if that helps.

Partition table scan:

  MBR: protective

  BSD: not present

  APM: not present

  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): P

Disk /dev/disk1: 5860533168 sectors, 2.7 TiB

Logical sector size: 512 bytes

Disk identifier (GUID): AC39F17B-8E64-442F-B254-ABF8AE371DA6

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 5860533134

Partitions will be aligned on 8-sector boundaries

Total free space is 2317 sectors (1.1 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name

   1              40          409639   200.0 MiB   EF00  EFI System Partition

   2          409640      3906398855   1.8 TiB     AF05  Internal Drive

   3      3906398856      3907668615   620.0 MiB   AB00  Recovery HD

   4      3907670016      5860532223   931.2 GiB   0700  BOOTCAMP

Command (? for help): R

Recovery/transformation command (? for help): O

Disk size is 5860533168 sectors (2.7 TiB)

MBR disk identifier: 0x00000000

MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code

   1                     1   4294967294   primary     0xEE

Recovery/transformation command (? for help):

Done. Here is the load out from the sudo gpt commands. and below it the load outs from gdisk. It's reverted to giving me the  "Windows cannot be installed to this hard disk space. Windows must be installed to a partition formatted as NTFS" error

sudo -w -r show /dev/disk1

sudo: illegal option -- w

usage: sudo -h | -K | -k | -L | -V

usage: sudo -v [-AknS] [-g groupname|#gid] [-p prompt] [-u user name|#uid]

usage: sudo -l[l] [-AknS] [-g groupname|#gid] [-p prompt] [-U user name] [-u

            user name|#uid] [-g groupname|#gid] [command]

usage: sudo [-AbEHknPS] [-C fd] [-g groupname|#gid] [-p prompt] [-u user

            name|#uid] [-g groupname|#gid] [VAR=value] [-i|-s] [<command>]

usage: sudo -e [-AknS] [-C fd] [-g groupname|#gid] [-p prompt] [-u user

            name|#uid] file ...

Christophers-iMac:~ christopherwoodside$ sudo fdisk /dev/ disk1

Password:

usage: fdisk [-ieu] [-f mbrboot] [-c cyl -h head -s sect] [-S size] [-r] [-a style] disk

  -i: initialize disk with new MBR

  -u: update MBR code, preserve partition table

  -e: edit MBRs on disk interactively

  -f: specify non-standard MBR template

  -chs: specify disk geometry

  -S: specify disk size

  -r: read partition specs from stdin (implies -i)

  -a: auto-partition with the given style

  -d: dump partition table

  -y: don't ask any questions

  -t: test if disk is partitioned

`disk' is of the form /dev/rdisk0.

auto-partition styles:

  boothfs     8Mb boot plus HFS+ root partition (default)

  hfs         Entire disk as one HFS+ partition

  dos         Entire disk as one DOS partition

  raid        Entire disk as one 0xAC partition

Christophers-iMac:~ christopherwoodside$

-----

Sudo gdisk /dev/rdisk1

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

NOTE: Write test failed with error number 1. It will be impossible to save

changes to this disk's partition table!

You may need to deactivate System Integrity Protection to use this program. See

https://www.quora.com/How-do-I-turn-off-the-rootless-in-OS-X-El-Capitan-10-11

for more information.

Partition table scan:

  MBR: protective

  BSD: not present

  APM: not present

  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): P

Disk /dev/rdisk1: 5860533168 sectors, 2.7 TiB

Logical sector size: 512 bytes

Disk identifier (GUID): AC39F17B-8E64-442F-B254-ABF8AE371DA6

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 5860533134

Partitions will be aligned on 8-sector boundaries

Total free space is 1805 sectors (902.5 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name

   1              40          409639   200.0 MiB   EF00  EFI System Partition

   2          409640      3904445575   1.8 TiB     AF05  Internal Drive

   3      3904445576      3905715335   620.0 MiB   AB00  Recovery HD

   4      3905716224      5860532223   932.1 GiB   0700  BOOTCAMP

Command (? for help): R

Recovery/transformation command (? for help): O

Disk size is 5860533168 sectors (2.7 TiB)

MBR disk identifier: 0x00000000

MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code

   1                     1   4294967294   primary     0xEE

Recovery/transformation command (? for help):

Sorry is this better?

sudo gpt -vv -r show /dev/disk1

Password:

gpt show: /dev/disk1: mediasize=3000592982016; sectorsize=512; blocks=5860533168

gpt show: /dev/disk1: PMBR at sector 0

gpt show: /dev/disk1: Pri GPT at sector 1

gpt show: /dev/disk1: 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  3904035936      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

  3904445576     1269760      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  3905715336         888        

  3905716224  1954816000      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  5860532224         911        

  5860533135          32         Sec GPT table

  5860533167           1         Sec GPT header

Christophers-iMac:~ christopherwoodside$

Windows8.0 not 8.1

If it helps, this is the process I did on the first time. Which I pulled from (Reinstalling Windows though BOOTCAMP yields "We couldn't create a new partition or locate an existing one. Form more information, see setup log files")

• Sudo gdisk /dev/rdisk0
• P  (Print list of parts)
• R  (Recover)
• O (print current Hybrid MBR)
• 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)
• O  (print current Hybrid MBR)
• W (Write the new MBR)
• Y (Yes! write the new MBR)
• Reboot

I just finished creating the partition using the BCA and resetting the SMC and the NVRAM. I listed the steps i just took below for the results above but if you think i need to do it again please let me know.

1. Recombined partition using BCA

2. Reset SMC and NVRAM

3. Used BCA to remake second partition

4. Windows gave "Not NTSF" error

5. Sent the read outs above.

Is there any way to generate the MBR outside of BCA if it's seemingly not doing it on it's own?