Windows 10 Boot Camp install won't let me install on BOOTCAMP partition on Mac Pro with SSD drive

1) Both EFI partitions displays very similar structure if not the same.

2) Yes it does. It creates 4 partitions in total which one of them is MSR (16MB) and then throw different error. Let me do this again

The MSR should be about 128MB. Here is an example of a W8.1 EFI layout.

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 487712920 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

488122560 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

489392096 32

489392128 262144 4 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE

489654272 487450624 5 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

disk0s1: EFI 200MB

disk0s2: Mac 1.5TB

disk0s3: Mac Recovery 619MB

BC created:

disk0s4: OSXRESERVED 7.4GB

Windows 10 installer automatically created from 324GB unallocated space:

disk0s5: Recovery 450MB (433MB free)

disk0s6: System 100MB (95MB free)

disk0s7: MSR 16MB (16MB free)

disk0s8: Windows 301.8GB

error: "Windows detected that the EFI system partition was formatted as NTFS. Format the EFI system partition as FAT32, and restart the installation."

Is it possible installer doesn't allocate enough space for MSR by accident

After trying to install windows 10 without FAT partition prepared:

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *2.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage Macintosh HD 1.7 TB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data OSXRESERVED 8.0 GB disk0s4

5: Windows Recovery 471.9 MB disk0s5

6: EFI NO NAME 104.9 MB disk0s6

7: Microsoft Reserved 16.8 MB disk0s7

8: Microsoft Basic Data 324.1 GB disk0s8

/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage Macintosh HD 121.0 GB disk1s2

3: Apple_Boot Boot OS X 134.2 MB disk1s3

/dev/disk2 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD +1.8 TB disk2

Logical Volume on disk1s2, disk0s2

C63A2632-ED74-4AEB-998E-3265C2333025

Unencrypted Fusion Drive

Disk0s6 is your Windows EFI. What does diskutil list disk0 show?

please see post I posted right before your answer

Post the output of diskutil info disk0s6.

Device Identifier: disk0s6

Device Node: /dev/disk0s6

Whole: No

Part of Whole: disk0

Device / Media Name: EFI system partition

Volume Name: Not applicable (no file system)

Mounted: Not applicable (no file system)

File System: None

Partition Type: EFI

OS Can Be Installed: No

Media Type: Generic

Protocol: SATA

SMART Status: Verified

Volume UUID: F4628D8D-9BC9-3B68-8893-260F46A92805

Disk / Partition UUID: C3C78851-241F-4095-82CD-779E14C46BD8

Total Size: 104.9 MB (104857600 Bytes) (exactly 204800 512-Byte-Units)

Volume Free Space: Not applicable (no file system)

Device Block Size: 512 Bytes

Read-Only Media: No

Read-Only Volume: Not applicable (no file system)

Device Location: Internal

Removable Media: No

Solid State: No

Meanwhile, official Apple support informed me my partitions looks good and encouraged me to try with USB-key again or redownloaded windows ISO. If problems persist I should contact Microsoft.

Yes, please try and post any error messages.

I asked Microsoft support and they instantly denied any help since realised I'm Mac user. I contacted MS support 3 times, two chats, one call. No-go.

I do have new error now:

"Windows could not complete the installation. To install Windows on this computer, restart the installation."

This is new! I'll check other forums.

If you have El Capitan, please disable SIP and test. This looks much better than previous errors.

1. Boot into Local Recovery (Command+R).

2. Start Utilities -> Terminal.

3. Type csrutil disable in Terminal and press Enter/Return.

4. Type csrutil status.

5. Boot normally, and type csrutil status to confirm that all individual entries are still disabled.

I'm sorry I didn't wrote the error message correctly. (I didn't wrote it down and then tried to remember searching for similar msgs)

I did csrutil disable and checked next reboot so it is really disabled

precisely the error message is: "Windows could not prepare the computer to boot into the next phase of installation. To install Windows, restart the installation."

This message is much better tan partition-related messages. This is usually the case when BCD cannot be written to the disk. It can happen due to permission issues. Are you running the Windows installation using a Mac account which has Administrative rights to the Mac?

I do. It's my own mac, having only one user account there and it has admin rights.

Was this message generated after SIP was disabled and installation was retried? If yes, can you check if the main Bootcamp volume shows any files in the OSX Finder? Since it was further along, there should be logs.