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Q: "we couldn't create a new partition" 8.1 installation screen, iMac 5k

Well, here we are again.

 

I'm using an iMac 5k with a fusion drive. I'm trying to install Windows 8.1 and I'm getting the dreaded "we couldn't create a new partition" error during the windows installation screen. I also tried the format option within the windows installation partition screen. I ran into the issue before and instead used an Windows Enterprise ISO without any problems. Well that expired and now I'm back to using 8.1 Professional with a valid key. I also used a valid ISO retrieved from Windows. I didn't do anything to interrupt the Bootcamp assistant process. It wouldn't through the EFI drive. Can someone help me? Also can someone answer why this issue is prevalent through the iMac 5ks?

 

I'm using a USB 2.0 drive. Nothing else is plugged in.

 

 

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *121.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage                         121.0 GB   disk0s2

   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3

/dev/disk1

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *1.0 TB     disk1

   1:                        EFI EFI                     209.7 MB   disk1s1

   2:          Apple_CoreStorage                         878.9 GB   disk1s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3

   4:       Microsoft Basic Data                         120.5 GB   disk1s4

/dev/disk2

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           *994.0 GB   disk2

                                 Logical Volume on disk0s2, disk1s2

                                 51129D2B-BB20-4415-9620-8517A8EC8ADC

                                 Unencrypted Fusion Drive

/dev/disk3

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:     FDisk_partition_scheme                        *8.0 GB     disk3

   1:                 DOS_FAT_32 WININSTALL              8.0 GB     disk3s1

Mac-ac87a3100dd4:~ arashsahba$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 663F07EF-1F60-4CDB-AA72-5D3EA183E579

    =========================================================

    Name:         Internal Drive

    Status:       Online

    Size:         999855611904 B (999.9 GB)

    Free Space:   376832 B (376.8 KB)

    |

    +-< Physical Volume EC85191A-14F7-4871-AB96-24D19B592A6D

    |   ----------------------------------------------------

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     120988852224 B (121.0 GB)

    |

    +-< Physical Volume B46EAAAC-84A7-46E5-8375-E94692C4A837

    |   ----------------------------------------------------

    |   Index:    1

    |   Disk:     disk1s2

    |   Status:   Online

    |   Size:     878866759680 B (878.9 GB)

    |

    +-> Logical Volume Family B176540C-DB00-4534-B7DB-F35881AB28E6

        ----------------------------------------------------------

        Encryption Status:       Unlocked

        Encryption Type:         None

        Conversion Status:       NoConversion

        Conversion Direction:    -none-

        Has Encrypted Extents:   No

        Fully Secure:            No

        Passphrase Required:     No

        |

        +-> Logical Volume 51129D2B-BB20-4415-9620-8517A8EC8ADC

            ---------------------------------------------------

            Disk:                  disk2

            Status:                Online

            Size (Total):          993999978496 B (994.0 GB)

            Conversion Progress:   -none-

            Revertible:            No

            LV Name:               Macintosh HD

            Volume Name:           Macintosh HD

            Content Hint:          Apple_HFS

iMac (Retina 5K, 27-inch, Late 2014), OS X Yosemite (10.10.1), null

Posted on May 9, 2015 5:04 AM

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Q: "we couldn't create a new partition" 8.1 installation screen, iMac 5k

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