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#Media center os partition for windows 7 windows 7
You can confirm that you are having this issue if the "missing" drive or partition in Windows 7 is labeled "system" in drive management. When Windows 7 does this, it defines this partition (or 2nd hard drive) as a "system" drive, and does not assign a drive letter. If you are installing Windows 7 and there is already a hard drive with multiple partitions, OR if there is more than one hard drive present, Windows 7 does NOT create a new "system files partition", but instead automatically copies system files to one of these pre-existing partitions (or to the 2nd hard drive) EVEN IF you have already indicated that you wanted to copy the OS ONLY to the primary drive or primary partition.
#Media center os partition for windows 7 install
When you install Windows 7 on a single drive, it creates a special dedicated partition for system files, and labels this space "reserved" - and tries as much as possible to hide it from you (by not allowing standard read/write access, for example). This can happen with partitions as well as free-standing hard drives.

(though I did run the startup repair tool it bailed out mid process giving an unknown error (too many system discs, the boot disc not the pole position!?).Here's what's happening with these hard drive issues and Windows 7. Shuffling the drives around in Bios seems to have solved this one. At the first reboot, BOOTMGR was missing (damn more work needed). some notes: after setting the install partition as System, using the above method, I had to reboot. Slight change in the numbers for me, as I had several drives and many partitions. The commands you listed where of course what I was looking for. Anyhow thankyou for ending what might have been a huge search. (it is after midnight from a long day - which included my largest newest hard drive crashing, the one with the main working OS on it). And for the life of me I could not remember which command I needed. Then I started mucking around with the dos prompt.

My mind raced to downloading a linux distro, making a bootable flash drive/usb stick, and gparting my way to success. Well I had my netbook and an internet connection handy. When the error occoured (again) tonight, I thought I was going to be completely caught out, having no access to and other Discs than my Se7en RC installer. Previously when this error occoured I would flip an old XP disc in and use the drive setup options in the installer to setup the partitions, which always gave me the solution. I thought I could be searching all night for this solution. Continue with the install and Windows 7 should be able to then use the unallocated space to create it's own partition and install." (from Ronnie Vernon, another post) This will delete the partition and it will then appear as Unallocated Space. Or try this: "When you select the partition where you wish to install, you should see the buttons appear that allow you options to configure that partition. Oh man, I think I'm better in doing that in explaining things. That's justified as it starts the multiboot process. (An active partition is the one that starts the computer and must contain an OS, otherwise it could start nothing.) In the result, after Win7 install, you have indeed two system partitions with two different OS's, but the active one of both gets the internal name "SYSTEM" and the other, as it is also bootable, gets the name "START". And don't set the new partition to active because Setup will think you plan to install Win7 over an existing OS which obviously isn't the case because your new partition contains no data at all. So, if you already created two primary partitions (not two system partitions, my fault), the only thing that remains is to install a new system on D: (= Win7 setup). In my case, the result after successfully installing Win7 to dual-boot is that in Win7 disk drive management shows: C(XP): System, active, primary - D(Win7): Start, primary. Sorry, I used technically uncorrect terms.
