HT203738: If you see a partition alert while using Boot Camp to install Windows
Learn about If you see a partition alert while using Boot Camp to install Windows
Q: Have been trying to install Windows using boot camp. For some reason after it creates the boot camp partition and starts the ... more
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Dec 5, 2015 3:12 PMby Loner T,The disk1s2 2.2 TB disk is meant to be resized into a BC partition for you to use. In the current state, BCA will give you an error about a single OSX Partition.
Can I suggest a manual diskutil command and we can check if the partitioning is done correctly? This will give you roughly 300GB (3.1TB - 2.8TB) for Bootcamp
diskutil cs resizeStack CD57CF57-5ED3-4A99-9686-17793882BB3D C53E3AC8-707E-4C96-BEC9-485BC95294BF 2800g fat32 BOOTCAMP 0g
The syntax of the command is ...
diskutil cs resizestack
Usage: diskutil coreStorage resizeStack
lvUUID|MountPoint|DiskIdentifier|DeviceNode [pvUUID] size
[part1Format part1Name part1Size part2Format part2Name part2Size
part3Format part3Name part3Size ...]
Resize both a logical volume and one of its underlying physical volumes in a
single operation. A single physical volume is always chosen for the underlying
shrink or grow, even if the logical volume's logical volume group is backed by
more than one physical volume. If you do not specify a particular physical
volume, then one is chosen for you. Note that if this is a grow operation,
this verb is limited by the physical volume's partition's room to grow.
Specifying zero as the size asks for an "automatic" grow-to-fill operation.
If this is a shrink operation, you can optionally request that new partitions
be created in the newly-formed free space gap in the partition map.
Again, note that this only resizes one of the underlying physical volumes; if
you need more sophistication in managing your topology, you should use the
separate physical and logical volume resize verbs.
Example: diskutil coreStorage resizeStack
11111111-2222-3333-4444-555555555555 10g JHFS+ New 1g
The alternative command using disks will be
diskutil cs resizeStack disk2 disk1s2 2800g fat32 BOOTCAMP 0g
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Dec 5, 2015 7:01 PMby Loner T,Let me explain it a bit better.
Your Fusion drive HDD part has the following layout.
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *3.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Internal Drive 2.2 TB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
4: Apple_CoreStorage Internal Drive 801.4 GB disk1s4
5: Apple_Boot Boot OS X 134.2 MB disk1s5
On a Fusion drive, the HDD is divided into three parts if the Windows installation is less than 1TB.
Part A = OS X Part between 0 and x TB, where x <= 2TB
Part B = Bootcamp in the remaining portion not to exceed 2TB.
Part C = OS X part from 2-3TB.
The layout you have has Part A and Part C. and Part A is 2TB. It is on this part - Part A - that we are trying to reduce the 2TB by sufficient amount to give you a BC partition.
This is done to ensure that the MBR (which cannot exceed 2TB and cannot have more than 4 entries) is visible to the Windows Installer so you can select it.
If you requested more than 1TB or more, and did not have Part C, you would have only Part A and Part B. Part C is not necessary.
The Fusion drive will have SSD + Part A + Part C.
This following command reduces the current CS volume (3.1TB) by say 300GB to 2800GB and allocates 300GB for BC. It uses UUIDs.
diskutil cs resizeStack CD57CF57-5ED3-4A99-9686-17793882BB3D C53E3AC8-707E-4C96-BEC9-485BC95294BF 2800g fat32 BOOTCAMP 0g
This following command uses disks/disk slices and achieves the same result. We are specifying a specific PV (disk1s2) to be the target of reduction on a CS volume (disk2).
diskutil cs resizeStack disk2 disk1s2 2800g fat32 BOOTCAMP 0g
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Dec 6, 2015 8:41 AMby Rdimick,Did first statement only - now have a boot camp partition.....just now not sure how to get windows on it...dont want it to try to make another partition. Also have a windows 10iso or a windows 8 CD....would prefer to just do the windows 10 install....using the windows 8 product key. Not sure if I will be able to install the windows 10 iso from the hard drive.
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Dec 6, 2015 10:18 AMby Rdimick,/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI NO NAME 209.7 MB disk0s1
2: Apple_CoreStorage Internal Drive 121.0 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *3.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Internal Drive 1.9 TB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s7
4: Microsoft Basic Data BOOTCAMP 314.4 GB disk1s8
5: Apple_CoreStorage Internal Drive 801.4 GB disk1s4
6: Apple_Boot Boot OS X 134.2 MB disk1s5
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +2.8 TB disk2
Logical Volume on disk0s2, disk1s2, ...
CD57CF57-5ED3-4A99-9686-17793882BB3D
Unencrypted Fusion Drive
RonMac:~ RonDimick$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group DD9B25E1-241F-4776-AD18-037A9DEC06FB
=========================================================
Name: Internal Drive
Status: Online
Size: 2806140715008 B (2.8 TB)
Free Space: 200704 B (200.7 KB)
|
+-< Physical Volume B0F3FA36-3A4A-4F50-8078-672359DB1117
| ----------------------------------------------------
| Index: 0
| Disk: disk0s2
| Status: Online
| Size: 120988852224 B (121.0 GB)
|
+-< Physical Volume C53E3AC8-707E-4C96-BEC9-485BC95294BF
| ----------------------------------------------------
| Index: 1
| Disk: disk1s2
| Status: Online
| Size: 1883715321856 B (1.9 TB)
|
+-< Physical Volume 5278CEDD-6276-4A4D-B8CC-CEA223FF0237
| ----------------------------------------------------
| Index: 2
| Disk: disk1s4
| Status: Online
| Size: 801436540928 B (801.4 GB)
|
+-> Logical Volume Family 0A78B302-223F-42FF-9ADB-C6BE07C42ED9
----------------------------------------------------------
Encryption Type: None
|
+-> Logical Volume CD57CF57-5ED3-4A99-9686-17793882BB3D
---------------------------------------------------
Disk: disk2
Status: Online
Size (Total): 2799999909888 B (2.8 TB)
Revertible: No
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint: Apple_HFS
LVG Type: Fusion, Sparse
RonMac:~ RonDimick$
Still not sure now that I have done this..how I start the windows install process without using the boot camp program. Or do I use the boot camp program and somehow skip making another partition.
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Dec 6, 2015 10:50 AMby Rdimick,1) I would like to install windows 10 - but can install windows 8.1 and then do the upgrade to windows 10. I have the windows 10 iso file on my desktop from Microsoft - or the windows 8.1 install cd.
2)
RonMac:~ RonDimick$ sudo fdisk /dev/disk1
Password:
Disk: /dev/disk1 geometry: 97451/255/63 [1565565872 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>
2: AC 1023 254 63 - 1023 254 63 [ 409640 - 3679131488] <Unknown ID>
3: AB 1023 254 63 - 1023 254 63 [3679541128 - 1269536] Darwin Boot
4: 0B 1023 254 63 - 1023 254 63 [3680811008 - 614152192] Win95 FAT-32
RonMac:~ RonDimick$
3) I can reboot
4) I am using El Capitan.
I did have windows installed on this machine before.....had to delete the parttition because I had updated to windows 10 - then there was an update to Windows - and while it was downloading I had a power interuption which messed up the update.
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Dec 6, 2015 11:01 AMby Loner T,1. Once you have installed W10, your Mac is registered with Microsoft. You should be able to re-install W10 directly. If you had W8.1 and upgraded in-place to W10, you did not use a BCA-created W10 installer.
2. If you have El Capitan and BC Assistant 6, Run BC Assistant 6. It should detect your MBR. W10 installs (and should be installed using EFI, not MBR on Macs after Late 2013 models) using EFI boot.
3. Were you on El Capitan during the last installation? Yosemite would behave differently. Was there an OSXRESERVED partition involved in your installation or a USB Installer?
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Dec 6, 2015 11:31 AMby Rdimick,Still having a hard time....appreciate all the help you are giving me. The I run BC Assistant 6 it gives me the option of removing the boot camp partition - which obviously I don't want to do. SO I choose to download windows files and install windows. It downloads the files on the USB drive and then only gives me the option to quit the boot camp assistant.
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Dec 6, 2015 11:49 AMby Loner T,Can you post a screen shot? If you have three options in BCA, Create USB Installer, Download Software, Install/Remove then choose only the first two. and build a USB Installer. Once it is built, shutdown your Mac with your USB Installer connected, power it back up and check which icons you get. If you get a Windows and EFI Boot from the USB, Windows will work, but EFI Boot will give you an error since we have an MBR. We can always remove the MBR and use the EFI boot, but it requires us to erase the BC FAT partition and convert it to Free Space, and then use EFI Boot.
