Windows 7 - How to move MBR between logical disks in one physical disk?

Hi all,

I have one 1 HDD with two logical drives. On both I have Windows 7 installed. On the second logical disk I have MBR and old windows which I do not need in the future. Now I need to move MBR to the first logical disk. Please help me?

As Windows can not boot with only Logical drives.
Can you post a screen shot of Disk management?
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Best is to unplug unwanted System HD, boot free Partition Wizard bootable CD to convert one Logical to Primary, then mark it Active, boot the Windows 7 DVD Repair console or REpair CD to run Startup Repair up to 3 separate times with reboots to write the System boot files to it.

Once it starts, install EasyBCD (older versions are still free) to add the second Windows 7 to a dual boot menu.

But post the screenshot first so we can make sure no unseen problems possibly exist.

I don't fully understand the problem.
You have 1 HDD containing one extended partition with 2 logical drives in it - correct?
If so then you have 1 MBR at the front of the HDD and EBRs (Extended boot Records) at the front of each logical drive. The EBRs look a little like an MBR but they are fundamentally not an MBR.
See here
Extended boot record - Wikipedia, the free encyclopedia

So what do you want to actually achieve?

Have seen disk management thoroughly and found what I wanted to know. Seems I can now close the thread. Thank you for your kind support and apologize for the trouble caused to you.

You caused absolutely no trouble. If you still have any questions at all get back to us and someone will help you out.