1.    01 Jun 2016 #1
    Join Date : Jun 2016
    Posts : 2
    Win10 Pro

    Dual Boot Anomally?

    Hi guys

    I posted this question on Tom's Harware but nobody on that forum answered me yet or seems to know the difference between the Win8.1 Pro and Win10 Pro 300MB/450MB partitions, so I thought I'd try and ask on TenForums instead. Here goes....

    I've 2 Macrium system images to restore to 2 separate SSDs for the purpose of dual booting Windows 8.1 Pro and Windows 10 Pro.

    Both system images have all 4 partitions created by Windows on install - see images...

    Click image for larger version. 

Name:	2.jpg 
Views:	5 
Size:	70.1 KB 
ID:	82770
    - Win8.1 Pro image has 300MB, 100MB, 128MB + C

    Click image for larger version. 

Name:	1.jpg 
Views:	5 
Size:	80.5 KB 
ID:	82769
    - Win10 Pro image has 450MB, 100MB, 16MB + C

    Now it's my understanding that the 300MB and 450MB partitions each contain files needed to use Bitlocker with each Windows Pro version respectively, as well as the BCD files.

    I'm tempted to just restore all partitions on the Win8.1 Pro image to the first SSD, then just restore the C partition from the Win10 Pro image to the second SSD and use Easy BCD to create the boot loader for Win10 Pro in the 300MB partition on the 1st drive. That'd roughly equate to what you get when you install a dual boot of Win8.1 Pro and then Win10 Pro normally.

    But what about the Win10 Pro Bitlocker files on the 450MB partition?

    And what is different with the 450MB partition that it needs an extra 60MB in size straight after install - do I loose some other functionality if the 450MB boot partition is ditched in favour of the 300MB boot partition?

    Last edited by expeditionist; 01 Jun 2016 at 15:43. Reason: typo
      My System SpecsSystem Spec

  2.    01 Jun 2016 #2
    Join Date : Jun 2015
    Posts : 1,580
    Windows 3.1 to Windows 10

    those two partitions on separate drives 300 / 450 are the OS Recovery Tools - WinRE.wim
    Windows 8.1 uses a Recovery Image Partition - which you do not have anyway..
    Windows 10 recovers itself from the windows\winsxs folder...

    not sure how best to proceed if you enabled bit locker
      My System SpecsSystem Spec

  3.    01 Jun 2016 #3
    Join Date : Jun 2016
    Posts : 2
    Win10 Pro

    Thanks Kyhi - in that case it might be better to try and restore the Win10 image completely and then just the C partition from the Win8.1 Pro image and then add the Win8.1 Pro boot files, but as you say, what about Bitlocker?

    I'll hang on a couple of days then - somebody here ought to know?
      My System SpecsSystem Spec


Similar Threads
Thread Forum
Solved Previous dual-boot: deleted old Win8, now Win10 won't boot
EDIT What actually went wrong and how to prevent this from happening to you: Solution #1 (slightly longer & requires two drives, but worked perfectly): Image your C:/ partition using Macrium, format & reinstall Windows (without any other...
Installation and Setup
Solved Reinstalling Windows 7 on 7/10 dual boot breaks dual boot
I installed the 10 tech preview along side my win 7 ultimate, I reinstalled, the Windows 7 side of the HDD because after however many years the OS had a LOT of clutter, and even though windows update was a nightmare I finally got all the updates...
Installation and Setup
Solved wrong drive letter in msconfig / boot in dual boot system
http://www.tenforums.com/attachment.php?attachmentid=61079&stc=1Hi guys in my desktop I have two hard disks ( disk 0 and disk 1 ) . Disk 1 is a clone of disk 0 created by Macrium Reflect Disk 0 : ( C: ) windows 10 pro , upgrade from windows 7 ...
Installation and Setup
Ubuntu Boot option still available in UEFI BIOS after Dual Boot
Recently I played around with dual booting Linux Mint on my system. I decided that I would delete it for the present as I have other things to focus on. However, after deleting partitions and fixing my MBR to only boot windows my UEFI BIOS still...
General Support
What is my upgrade path from dual boot back to single boot
My laptop has dual boot - Windows 7 and Windows 10. My Win7 environment is my main working environment with lots of programs installed and important files. I installed the Win10 environnment just to play around with 10 during the technical...
Installation and Setup
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 04:08.
Find Us
Twitter Facebook Google+

Windows 10 Forums