BCDEDIT - How to Use

I changed the number of cores in msconfig to 2 under the boot tab and now when i try to boot my computer it crashes on the starting windows window, I typed these bcdedit command on the cmd prompt "bcdedit /deletevalue {UUID} numproc" and the bcdedit /set {UUID} numproc 1" they both return this command "The element data type is not recognized, or does not apply to the specified entry Element not found" What i'm i doing wrong? please assist.

This was a very informative post, but unless I missed it, I didn't see how to move the BOOTMGR from one drive to another. I have VISTA Ultimate x64 installed on one drive and WIN 7 x64 installed on another. The drive containing VISTA is failing and I would like to remove it completely, but the BOOTMGR is located on that drive. How do I use BCDEDIT to relocate it to the drive containing WIN 7? I have included an image of the current BOOTMGR. Thanx in advance to anyone who can help me accomplish this.

Windows always starts booting from first disk and active partition on that disk.
Boot sequence in short is:
MasterBootRecord, active PartitionBR, bootmgr (uses BCD from \boot), winload

Method 1:
1. Run Disk Management and check if Windows 7 is on the active partition. If not set the partition to active. (It is best if first partion is active)
2. Write MBR & PBR on Windows 7 disk (use bootsect.exe)
3. Repair/create Windows 7 boot files on Win 7 disk (bootmgr + \boot folder with BCD) (use bcdboot.exe)
4. In BIOS set Windows 7 disk to be first disk in boot sequence.

If you want detailed instructions post a disk map.

METHOD 2:
JUST UNPLUG VISTA DRIVE and Startup Repair - Run 3 Separate Times

jackce said:

This was a very informative post, but unless I missed it, I didn't see how to move the BOOTMGR from one drive to another. I have VISTA Ultimate x64 installed on one drive and WIN 7 x64 installed on another. The drive containing VISTA is failing and I would like to remove it completely, but the BOOTMGR is located on that drive. How do I use BCDEDIT to relocate it to the drive containing WIN 7? I have included an image of the current BOOTMGR. Thanx in advance to anyone who can help me accomplish this.

Take a look here:
System won't boot from SSD, please help.

hello guys i need know what mean /d switch in bcdedit.
same like " bcdedit /copy {...} /d "..."
OR
Bcdedit /create {legacy} /d “...”
OR
bcdedit /create {ramdiskoptions} /d "Ramdisk options"
OR
bcdedit /create /d "Boot from WIM" /application OSLOADER

i can't find any Description in technet microsoft.

thank's

/d <description>

tnx siw2

Thanks Siw2 for usefull info here. Sorry, if it was already explained. I just didn't found exact description "how to" for me.
I have CentOS 5.6 on my primary SATA drive. Windows 7 Ultimate is installed on second SATA drive. I did some edit of grub config to have Windows 7 boot from second drive and it works just perfect untill ... one note before. I use hd0, hd1 for drives decription - I guess, BIOS mimics PATA drives. sd0 sd1 don't work.
So, what happens. I can choose CentOS from hd0 or Windows7 from hd1 on grub loader menu and it works. Untill I installed one more Windows 7 instance on hd0. I can't boot hd1 Windows since. I tried to edit grub config: adding "mark active" and so. No help. Windows loader get's the control and doesn't boots from secondary drive.
Windows boot choice will help me, I guess. I understand bcdedit command, I see "bcd" file I need. what lines must be added to "bcd" to solve this?

Algirdas,

The second instance of Windows overwrote your MBR, and failed to detect the first Windows on hd1. You can either work with the Windows loader, in which case I recommend EasyBCD, or you can repair the GRUB loader, which might be preferable since CentOS is your main OS. See TipsAndTricks/ReinstallGRUB - CentOS Wiki for some instructions for the latter.

When you say you marked Active, what did you mark active, and did you do so in GRUB, or in a partition manager?