Boot Camp Partition Not Shown on Boot Screen

Hello, yesterday I purchased a new 2015 15" MBP Retina (running Yosemite 10.10.5) to replace my aging Early 2011 13" MBP. The old machine had two partitions on a 480GB SSD: 1 for OS X and 1 for Windows 7. I used Migration Assistant to successfully import all of my OS X files from my old computer, and I made an image of the existing Boot Camp partition using WinClone and the old computer in Target Disk Mode.

However, after creating a Boot Camp partition on the new computer (by using a friend's Windows 8 install disk) and loading the WinClone image onto the new partition, the Boot Camp partition does not show up on the boot screen (when holding the Option key); also, the recovery partition is not present. Also, if I try to set BOOTCAMP as the startup partition in System Preferences, I get a message that "The bless tool was unable to set the current boot disk."

I have already tried the solution in a similar thread (Re: Repairing Boot Camp after creating new partition), using 4 instead of 5 as the partition to be moved to the Hybrid MBR, to no avail.

Thanks in advance to anyone who can offer me a solution!

MacBook Pro (Retina, 15-inch, Mid 2015), OS X Yosemite (10.10.5)

Posted on Oct 20, 2015 7:13 PM

18 replies

rscheil

Level 1

21 points

Oct 23, 2015 8:15 AM in response to gtolj2

Hi,

Winclone 5 will detect the Windows version and Mac hardware during restore and set the boot mode to EFI if both the WIndows OS and Mac hardware support it. For troubleshooting boot failure not related to device drivers, you can manually set boot mode from the Tools menu as shown in the screenshot in an earlier post. A look through the Console log after a restore will show what boot mode Winclone set for Windows. Get in touch at support@twocanoes.com and send the Console log by going to the Winclone Help menu, select Send Logs and attach the file to your request email.

Drive block size shouldn't be an issue (for now) unless trying to migrate Boot Camp from any Mac to-from the 2015 USB-C MacBook. The 2015 MacBook has the native advanced format 4K block size hard drive and block-level images like those created with WInclone are not interoperable between it and other Mac models that use the 512 byte block emulation.

A few of our customers have reported errors when running Sysprep on Windows 8/8.1 or 10 upgraded from Windows 7, so that may dictate a fresh install of Windows 10. There are reported workarounds to the Sysprep fatal error on upgraded Windows systems on the Windows forums but none we've seen are supported by Microsoft.

As already stated, the 2015 Macs do not support legacy BIOS booting, so that rules out running Windows 7 except as a virtual machine.

Russell Scheil

Twocanoes Software

support@twocanoes.com

Loner T

Level 9

59,536 points

Oct 23, 2015 8:18 AM in response to rscheil

Thanks, rscheil for providing more details.

gtolj2 Author

Level 1

0 points

Oct 24, 2015 5:40 AM in response to rscheil

Thank you both for your help. I ended up trying to install a trial of Win10 Enterprise on top of the existing BOOTCAMP partition. This actually worked for a couple reboots until the bootloader decided to skip loading Boot Camp again, and now I am stuck with just OS X. I think I'm just going to go to Best Buy and get a copy of Win10 Pro to fresh install.

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Boot Camp Partition Not Shown on Boot Screen