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Windows 7: Two System Reserved 100MB partitions

19 Aug 2012   #1

Windows 7 x64 Pro
Two System Reserved 100MB partitions

Hi All,

Somehow I have ended up with two system reserved partitions. I enclose a screenshot of my disk management screen.

Disk 1 is my primary Win 7 boot drive... Because of this I am assuming that D:/ which is the system reserved partition on that drive is needed.

However, disk 0 is just a backup I disk I use for data, music, videos etc..etc.. but somehow it seems to also have acquired a 100MB system partition (may be due to the fact that I used to have a dual boot linux setup).

Anyway, I am thinking that I can probably delete G:/ the 100MB partition on that drive. The only thing that worries me is that it's listed as 'active' as is D:/...

Also, should my main C:/ be made 'active'.

Help appreciated. Thanks.

Attached Thumbnails
Two System Reserved 100MB partitions-untitled.png  
My System SpecsSystem Spec
19 Aug 2012   #2

Windows 7 Pro with SP1 32bit

Welcome to the Seven Forums, SidharthaXx.

To me the Disk 1 System Reserved Partition appears to be the correct one because it is linked with the System Drive. But wait till you get some more expert opinions before tinkering.

As C:\ is working properly without being active I think it should be left alone.
My System SpecsSystem Spec
19 Aug 2012   #3
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

1. You cannot make C active because the bootmgr is sitting in one of those 100MB partitions.

2. Question is in which of the 100MB partitions and how did you end up with 2 system partitions. My guess is that the bootmgr is in the system partition of Disk0. You can test that by disconnecting Disk0 and see whether the system still boots. You can also check in the BIOS which disk is boot priority 1.

3. An easy fix would be to copy the bootmgr to C. Then you can forget both 100MB partitions.
My System SpecsSystem Spec

19 Aug 2012   #4

Windows 7 x64 Pro

Thanks for your replies.

Just to add how I got here... actually I've only just noticed this situation because I removed the grub loader from a dual boot scenario I was running with Linux. Decided to run Linux on a vritual machine inside Win 7 instead.

Anyway, Ok here is the current situation. If I disable all HDD's in the bios except Disk 1, then my windows 7 boots fine...
However, if I enable Disk 0 then my system won't boot and I go through to a grub command line prompt.

I hope this information helps. I mean it points to me that I should remove G:/ but I'm hoping someone more expert than me can verify.

Many Thanks
My System SpecsSystem Spec
19 Aug 2012   #5
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

Then wanchoo was right and I was wrong. Apparently the bootmgr is sitting in the 100MB partition of Disk1. The confusion apparently came from the Linux deal.

As long as Disk1 is first in the boot priority, nothing bad can really happen. But if it bothers you, you can get rid of the 100MB partition on Disk0. For that you probably need the bootable CD of Partition Wizard.

Free Partition Magic alternative, partition manager freeware, partition magic server, partition magic Windows 7 and free Partition Manager software for Windows 7/8/VISTA/XP/2000 and Windows Server 2003/2008/2000.
My System SpecsSystem Spec
19 Aug 2012   #6

Windows 7 x64 Pro


Ohh, so I can't just remove it with the Win 7 disk management tool?
My System SpecsSystem Spec
19 Aug 2012   #7
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

You can try. But I don't think it will work. The option may be greyed out.
My System SpecsSystem Spec
19 Aug 2012   #8


We know that DISK1 contains the Active System boot files since it holds the System flag signifying this.

For that reason you can mark System Reserved on Disk0 Inactive and delete it:
Partition - Mark as Inactive - Windows 7 Forums
Partition or Volume - Delete

I would prefer having the Win7 HD as DISK0 so that future repairs won't possibly derail the boot files to DISK0 - especially if it incorrectly has an Active partition - so you can also accomplish that by swapping its cable with DISK1. Make sure the Win7 HD remains set first to boot in BIOS setup.
My System SpecsSystem Spec

 Two System Reserved 100MB partitions

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