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

I made a video: Dualboot Mac/windows installation issue all messages are written in quotes in my first post.

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"

You both have the same exact issue which is very well documented here - Boot Camp: "We couldn't create a new partition or locate an existing one" alert during Windows 8 install - Apple Support . The video shows Drive 1. Drive 1 and all other storage must be disconnected. If you have split the Fusion drive manually, you will have additional issues.

ok, please wait a little time. I Will try this now. thanks if it works !

How would you disconnect fusion's drive swap drive? (drive 1) Fusion drive is hybrid HDD + SSD. Only way which might be an approach is to run diskutil from windows install in commandline and perform installation in comandline. I wouldn't dare, too scared about messing up my mac.

If it is a standard Fusion drive, the Windows installation should be on Drive 1. All other external storage must be disconnected.

BobMcKenzie wrote:

 

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"

How do you have a 483Gb Drive 0? Standard Fusion is 120Gb SSD + 1/2/3TB HDD. Please post the output of diskutil list and diskutil cs list from OSX Terminal.

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

Can you post the output of the two Terminal commands I posted earlier?

diskutil list

diskutil cs list

/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                         323.0 GB   disk0s4

/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 disk0s2, disk1s2

                                 7251BE28-63DE-42B8-87A9-41A132B679EC

                                 Unencrypted Fusion Drive

Sorry about the image, didn't find plaintext toggle

Your Fusion drive is incorrect and is causing BC to fail. You have the 1TB HDD as disk0 at index 0, it should be index 1. The SSD must always be index 0, otherwise your OSX performance and Fusion functionality is incorrect. You need to backup OSX, boot into Internet Recovery and rebuild your Fusion drive correctly before attempting a Windows installation.

I just did a full rebuild of my Fusion drive in Recovery mode. and Disk util rebuild it as per apple default with SSD as disk 1 and my 3TB as disk 0

So i wouldn't recommend above from Loner. as i dont think Disk util will rebuild it in any other way.

Edit: Based on what Loner T just wrote, this howto may be incorrect !!!

By the way, when someone realises to mess fusion drive partitions, there is a way how to revert everything to original state. Following steps worked for me (late 2015 iMac 2TB fusion). You will LOOSE EVERY DATA ON OUR MAC so backup first!

0) delete any partitions previously created by Windows installation or boot camp assistant if any

1) cmd+r on boot after boot-up sound, for 4 secs, recovery screen appears after minute

2) Top bar -> Utilities -> Terminal

3) diskutil cs list

4) select and copy logical volume ID at the top (in my case it was 50FBAD7C-8655-43F2-8B85-E60DDA4A5894 )

5) diskutil cs delete <paste logical volume ID>

example: diskutil cs delete 50FBAD7C-8655-43F2-8B85-E60DDA4A5894

6) last output should be "Finished CoreStorage operation"

7) diskutil list

8) You should see that APPLE HDD ST20 location (/dev/disk0 in my case) and APPLE SSD SM01 (/dev/disk1 in my case), use them in correct order in next command as you can see

9) diskutil cs create Macintosh\ HD <HDD> <SSD>

example: diskutil cs create Macintosh\ HD disk0 disk1

10) last output line should be "Finished CoreStorage operation"

11) diskutil cs list

12) select and copy logical volume ID at the top (in my case it was 28EB112E-C9D8-444D-8BAC-7876B768740A )

13) diskutil cs createVolume <paste logical volume ID> jhfs+ Macintosh\ HD 100%

example: diskutil cs createVolume 28EB112E-C9D8-444D-8BAC-7876B768740A jhfs+ Macintosh\ HD 100%

14) close terminal (corner red X button, when I did different approach by typing exit, recovery menu didn't recover)

15) choose Disk Utility from recovery list

16) you should see Fusion drive with macintosh HD only

17) close Disk Utility (corner red X button)

18) chose Reinstall OS X

19) follow reinstall steps

If what you're saying is correct, howto I just wrote is incorrect. I was instrued by official Apple senior support and this is the result. It's not easy for me to wipe everything now. Can anyone please post correct post how to rebuild fusion drive correctly? I bought this iMac with exactly this setup (dev0 HDD, dev1 SSD) so it was default configuration.