Unable to partition my HD using Bootcamp Assistant

Hello, i`m trying to install Win 8.1 on my Mac Pro, i have a 3TB HD with a single partition. When i try to start Bootcamp Assistant it spits out: "The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows"
This is my partition map:
$ 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 Macintosh HD            3.0 TB     disk0s2
$ sudo gpt -vv -r show /dev/disk0
Password:
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  5859861344      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  5860270984      262151        
  5860533135          32         Sec GPT table
  5860533167           1         Sec GPT header
$ sudo fdisk /dev/disk0
Password:
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 idea? Thanks!

Bootcamp Yosemite 10.10.1 "The startup disk cannot be partitioned or restored to a single partition."

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