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

Hello,

thanks for all, it works perfect.
The Problem was the ext. Hard disk via USB

danke

How many disk drives are connected in your Mac Pro?

You will need to unfreeze the volume. Fsck should be run in Internet Recovery, otherwise, the Recovery HD being mounted will interfere with fsck.

no, i get the message that i can't install on this partition.

Theres no Options to click, i can click on "format".
Then i geht the Same message.

on this site you can see the supported models Use Windows 10 on your Mac with Boot Camp - Apple Support

Theres no iMac Late 15 5K 27"

But is that really the problem?

thanks

Apple doesn't update their pages much. There are still old boot camp assistant howtos. When I contacted support regarding very same issue, they forwarded my case to technical support over the weekend. Hopefully I'll get response soon. Meanwhile I created bootable Windows 8.1 USB on MBPro mid 2014, El Capitan with same issue. Now I modified bootcamp assitant Info.plist ( Enable Bootcamp to install from usb for OSX 10.9**WORKS** ) and created bootable windows 10 on the same mac I'll be doing install and created partition manually with disk utility.

Hello,

please watch the video from Plysovej_Katktus.
I have the same Problem.

this is the screen after i format the Bootcamp Partition.

in englisch it means. "can't make a new Partition or find a Partition"

In video, all external drives were disconnected, nothing was connected to usb, not even a mouse nor keyboard. Here is how 2015 mac default drive layout is displayed in windows 10 installation:

/dev/disk0s1: HDD EFI

/dev/disk0s2: Macintosh HDD

/dev/disk0s3: Macintosh Recovery

/dev/disk1s1: SSD EFI

/dev/disk1s2: Swap SSD

/dev/disk1s3: Swap Recovery ?

bootcamp adds 2 more:

/dev/disk0s4: Windows install

/dev/disk0s5: Bootcamp target drive

So there really isn't any external or other drive connected. All is one internal fusion hybrid drive. If you can't see it there your fusion drive can't even work properly. When you delete drive1 partitions, you just stripped yourself from hybrid functionality

You are confusing disk0 and disk1 with CS PV indices. disk0 and disk1 are based on probes by controllers to discover disks. They have no relationship with the CS index. Once a CS is built, the order of discovery may change and disk1 may be the SSD. The CS unit stores the indices and manages data block movement based on CS PV Indices, not the diskN numbering. The instructions you wrote need to account for the ordering of the fast vs slow disks. As I posted earlier, see the IO test results. You want the slower disks at index 1...n not at 0. If you have multiple SSDs, you must ensure that the faster disks have lower indices than any of the slowest disks.

I have had to fix the Apple instructions over the years. Please see the links I have posted.

/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 1.3 TB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s6

4: Microsoft Basic Data OSXRESERVED 8.0 GB disk0s4

5: Microsoft Basic Data BOOTCAMP 651.7 GB disk0s5

/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 +1.5 TB disk2

Logical Volume on disk1s2, disk0s2

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

Unencrypted Fusion Drive

/dev/disk4 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: ESD-ISO +3.5 GB disk4

New bootcamp on iMac doesn't give you 3 choices anymore. It creates partition with windows installation. This is listed while bootcamp is preparing windows to install. Normally, 4 and 5 are not there.

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

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.

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?

Do you get an error about GPT vs MBR?

Please see this example El Capitan Upgrade bootcamp not showing Windows 10 .

Your issue could be discussed in How do I get bootcamp 6.1 / AMD 15.201.2001.0 drivers thread. I answered there.

Deleted all the Disks -> Create new Disks -> Next 😁 . Muahaha .