iMac Retina - BootCamp - Windows 10 - Partition Problem

Do you have a Fusion drive on your iMac 5k ?

Can you post the output of the following OSX Terminal commands?

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

sudo gpt -vv -r show /dev/disk1

sudo fdisk /dev/disk1

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

Bootcamp partitioning failed miserably.

EFI boot requires MSR (System Reserved - FAT) and MSD (Data - NTFS). BCA did not choose this path.

Legacy BIOS boot requires, MBR and a partition within the first 2TB start point, otherwise it will fail.

BCA did not do it correctly. Can you remove the BC Partition using BCA only? Once it is removed,

1. Run Disk Utility Repair Disk.

2. Run the following two procedures.

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

3. Run BCA and once the partitioning is complete see if it works. If it does not, please post the output of the same commands, and we can figure what manual intervention should be made to make BCA work correctly.

Please back up OSX and Windows to separate external disks, if possible.

Loner T, thank you. I've been struggling all weekend to get Windows 10 installed on my 5K iMac, and it was as simple as an SMC reset/NVRAM reset that solved it. Same issue as the first post in this thread, - now solved. Thank you!

Hi,

I have exactly the same issue as above, but your remediation steps didn't work for me. The error I get from the Windows 10 installation is (from X:\Windows\panther\ log):

IBSLIB CanBeSystemVolume: Volume at disk [0] offset [0x676c200000] doesn't meet criteria for system volumes...

ISBLIB DiskRegionSupportCapability:Region on disk [0] (offset [0x676c200000]) is BLOCKED against capability [CanBeSystemVolume] for the following reasons...

ISBLIB LogReasons: [BLOCKING reason for {disk 0 offset 0x676c200000}: CanBeSystemVolume] The selected disk space is not of type ESP.

I've followed the instructions as per the original poster 4-5 times with no luck. Any help from the experts here would be much appreciated.

My setup (with the BOOTCAMP partition created) is:

disk3, disk4 & disk5 are a software raid array of 2 USB3 disks.

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 443.3 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 56.1 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *443.0 GB disk1

Logical Volume on disk0s2

944BCAF6-62DE-42A3-BE0D-6B330E4A0D22

Unencrypted

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *31.4 GB disk2

1: DOS_FAT_32 WININSTALL 31.4 GB disk2s1

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk3

1: EFI EFI 314.6 MB disk3s1

2: Apple_RAID 3.0 TB disk3s2

3: Apple_Boot Boot OS X 134.2 MB disk3s3

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk4

1: EFI EFI 314.6 MB disk4s1

2: Apple_RAID 3.0 TB disk4s2

3: Apple_Boot Boot OS X 134.2 MB disk4s3

/dev/disk5

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS My Book *3.0 TB disk5

diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group ED71E5DF-1FFE-44E6-9D94-7E56E194CD83

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

Name: Macintosh HD

Status: Online

Size: 443335540736 B (443.3 GB)

Free Space: 0 B (0 B)

|

+-< Physical Volume AE49F86B-7F9D-4E15-9C06-125915143010

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

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 443335540736 B (443.3 GB)

|

+-> Logical Volume Family CEC7DA91-80F7-4509-BD3C-5BD8000C9767

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

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 944BCAF6-62DE-42A3-BE0D-6B330E4A0D22

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

Disk: disk1

Status: Online

Size (Total): 442999996416 B (443.0 GB)

Conversion Progress: -none-

Revertible: Yes (no decryption required)

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=500277790720; sectorsize=512; blocks=977105060

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 977105059

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 865889728 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

866299368 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

867568904 760

867569664 109535232 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

977104896 131

977105027 32 Sec GPT table

977105059 1 Sec GPT header

sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 60821/255/63 [977105060 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 977105059] <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

sudo gpt -vv -r show /dev/disk1

gpt show: unable to open device '/dev/disk1': Resource busy

sudo fdisk /dev/disk1

fdisk: /dev/disk1: Resource busy

Naeem wrote:

I have exactly the same issue as above

, but your remediation steps didn't work for me. The error I get from the Windows 10 installation is (from X:\Windows\panther\ log):

No. You have a different issue. Please see Boot Camp doesn't support RAID configurations - Apple Support .

Eject disk3/4 RAID, disk5 MyBook. You need to use only the internal disk0 and the USB Installer for the entire duration of the Windows installation. What year/model is your Mac?

Ah, will try again with the external drives disconnected.

iMac (Retina 5K, 27-inch, Late 2014)

Processor 4Ghz Intel Core i7

Memory 24GB 1600 MHz DDR3

Startup Disk Macintosh HD

Graphics AMD Radeon R9 M295X 4096 MB

This sorted my problem, many thanks.

Please ensure you have good backups of OSX and Windows.