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Windows 7: Win7 MBR Issues After New Deleted Dual Boot

18 Jan 2011   #11
mjf

Windows 7x64 Home Premium SP1
 
 

The partition active flag is a setting (0x80) in the MBR (512 bytes at front of disk) which informs the BIOS that there is an active, potentially bootable partition. Setting a partition active in windows will set this MBR flag.
The BIOS will report an MBR error if no flag (byte) in the partition table is set active.
The disk obviously needs to be formatted NTFS and created primary active for the MBR to be created with a partition (one in your case) marked active.


My System SpecsSystem Spec
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18 Jan 2011   #12
Zoidbort

Win7 Pro
 
 

OK so in Option 2 #3 I have this:

Partition 0 Extended 111GB 1024 KB
Partition 1 Logical 111GB 2048 KB

I assume I pick the Extended and try to make that active?
A few conflicting ideas from different members here but this is worth a shot
I have backed up my stuff from the SSD to a thumb stick via going in and choosing to locate disk files, so that is a bonus.
My System SpecsSystem Spec
18 Jan 2011   #13
gregrocker

 

Both are logical partitions which cannot be marked Active.

The next step is to download and burn to CD free Partition Wizard bootable CD. Free Download Magic Partition Manager Software - Partition Wizard Online

Boot PW CD, post back a camera snap of the drive map and listings if possible.

You will want to rightclick the Win7 partition to Modify>Convert to Primary, OK.

(If Win7 is a sub-partition within the Extended Logical partition, you'll need to delete the other sub-partitions until PW will allow you to Convert Win7 sub-partition.)

Then rightclick Win7 partition again to Modify>Set to Active, OK,

Then on the Disk tab run Rebuild MBR, Apply all steps.

If Win7 doesn't start at reboot, boot into Win7 DVD Repair console or Repair CD to run Startup Repair up to 3 separate times with reboots until Win7 starts.
My System SpecsSystem Spec
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18 Jan 2011   #14
Zoidbort

Win7 Pro
 
 

It is odd that an active OS drive is a logical one, no?
I suppose the active C: OS drive had the MBR info to tell the logical drive what to do?
My System SpecsSystem Spec
18 Jan 2011   #15
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate
 
 

If you're saying the Windows 7 partition on the SSD is a Logical drive on an Extended partition, you will have to use the Partition Wizard boot disk to convert it to a Primary partition before the Windows boot files will be created there; have a look at Option Four of this tutorial at the link below for an outline of the process.

Partition Wizard : Use the Bootable CD


Since you got the data off the SSD you may be better off just wiping the entire SSD and to start over; have a look at this tutorial so you can use the Windows 7 installer to do the wipe (secure erase) then use Step Two #2 (just leave the size= blank) to create a partition to do a clean install to.

SSD / HDD : Optimize for Windows Reinstallation




This has to be the case as Windows will not, is not able to boot from an Extended partition.

Quote   Quote: Originally Posted by Zoidbort View Post
It is odd that an active OS drive is a logical one, no?
I suppose the active C: OS drive had the MBR info to tell the logical drive what to do?
My System SpecsSystem Spec
18 Jan 2011   #16
Zoidbort

Win7 Pro
 
 

Ugh...what a hassle having to reinstall all my stuff once again
Should I try making it active 1st you think?
Worth a shot?
My System SpecsSystem Spec
18 Jan 2011   #17
gregrocker

 

Of course, why not?

I gave you the steps to convert to Primary then mark Active.

We help people do this same thing here regularly.
My System SpecsSystem Spec
18 Jan 2011   #18
Zoidbort

Win7 Pro
 
 

Trying to figure out how to burn that iso with Toast lol
Not a huge fan of Macs haha but it is my laptop I use for Garage Band
Burned it a few times different ways but it will not boot from the CD
My System SpecsSystem Spec
18 Jan 2011   #19
Zoidbort

Win7 Pro
 
 

OK once I get this working....argh what partiton do I set as active?
The Logical I assume?
My System SpecsSystem Spec
18 Jan 2011   #20
gregrocker

 

Did you read the specific steps I posted?

Quote   Quote: Originally Posted by gregrocker View Post
Both are logical partitions which cannot be marked Active.

The next step is to download and burn to CD free Partition Wizard bootable CD. Free Download Magic Partition Manager Software - Partition Wizard Online

Boot PW CD, post back a camera snap of the drive map and listings if possible.

You will want to rightclick the Win7 partition to Modify>Convert to Primary, OK.

(If Win7 is a sub-partition within the Extended Logical partition, you'll need to delete the other sub-partitions until PW will allow you to Convert Win7 sub-partition.)

Then rightclick Win7 partition again to Modify>Set to Active, OK,

Then on the Disk tab run Rebuild MBR, Apply all steps.

If Win7 doesn't start at reboot, boot into Win7 DVD Repair console or Repair CD to run Startup Repair up to 3 separate times with reboots until Win7 starts.
My System SpecsSystem Spec
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 Win7 MBR Issues After New Deleted Dual Boot




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