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Question: The startup disk cannot be partitioned or restored to a single partition - Tried Everything - Version 2

Hi,


I have late 2012 iMac with a brand new 3TB Deskstar Hard Drive. No Fusion Drive. Sierra was installed. Boot camp gave me the message - The startup disk cannot be partitioned or restored to a single partition.


diskutil list


#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Big Moe 3.0 TB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3


diskutil cs list

No CoreStorage logical volume groups found


I planned on following Install Windows 7 on your Mac using Boot Camp - Apple Support

and based on the table it is a five (5) but I cannot get to this stage.

iMac (27-inch, Late 2012), macOS Sierra (10.12.6)

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Nov 11, 2017 12:08 PM in response to Mac320 In response to Mac320

You don't have a cs managed drive. Use diskutil list. How are attempting to partition the drive? The drive appears to be a single partition. Nothing to be restored. Partition the drive using Boot Camp Assistant. You should install Win 10, not 7 which is no longer supported.

Nov 11, 2017 12:08 PM

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Nov 11, 2017 1:05 PM in response to Mac320 In response to Mac320

You should be able to install W7 on your 2012 iMac. Your iMac allows only a legacy BIOS installation of Windows (7/8.1/10), which uses a Hybrid MBR. Due to limitations of a MBR,


  • your Windows partition must be >1TB, or
  • must be 'sandwiched' between two chunks and should start within the first 2TB of the disk. This requires a CS volume, if you want the chunks to behave like a contiguous macOS JHFS+ volume. Since you do not have a SSD, some of the benefits do not apply.


You can use

  • a USB2 flash drive build by BC Assistant for the Windows installer, or,
  • a DVD in your built-in Optical drive and the USB2 flash drive used to store the BC drivers.


A manual build of a USB2 flash drive Installer is also possible, using Build your own Windows 10 Bootcamp USB Installer (this is valid for W7/W8.1 as well). This replaces the first two tasks - Create and Download - in BCA.


Partitioning can be done using Disk Utility, as long as you use a tool (like GPT Fdisk) to create a matching MBR.

Nov 11, 2017 1:05 PM

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Nov 11, 2017 1:18 PM in response to Loner T In response to Loner T

I thought it was dropped earlier than his model. He will need the BC support: Boot Camp Support Software 5.1.5621 for 64-bit or Boot Camp Support Software 4.0.4326 for 32-bit. Also, for reference: Boot Camp- System requirements for Microsoft Windows operating systems, including mine.


BTW, a Windows partition greater than 1TB? Don't you mean less than?

Nov 11, 2017 1:18 PM

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Nov 11, 2017 1:27 PM in response to Kappy In response to Kappy

Kappy wrote:


I thought it was dropped earlier than his model. He will need the BC support: Boot Camp Support Software 5.1.5621 for 64-bit or Boot Camp Support Software 4.0.4326 for 32-bit. Also, for reference: Boot Camp- System requirements for Microsoft Windows operating systems, including mine.

W7 is supported on Macs up to 2014 models. 2015 and later models dropped CSM-BIOS and effectively dropped support for W7.


Kappy wrote:


BTW, a Windows partition greater than 1TB? Don't you mean less than?

The layout on 3TB disks (including Fusion equivalents) is typically


  • for less than 1TB Windows partition - macOS + Windows + macOS, with the two macOS parts in a CS, or,
  • for greater than 1TB Windows partition - macOS + Windows


This allows 32-bit numbers used in a MBR to accommodate up to 2TB Windows partitions in BIOS mode. EFI has no such restriction, but requires W8.1/W10. EFI in W7 is very painful.


Apple never went to 4TB disks or equivalent Fusion drives.

Nov 11, 2017 1:27 PM

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Nov 11, 2017 4:19 PM in response to Mac320 In response to Mac320

I would love to just get past the first prompt. I have had great success in the past with installing boot camp. I just cannot figure this one out.

Nov 11, 2017 4:19 PM

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Question: The startup disk cannot be partitioned or restored to a single partition - Tried Everything - Version 2