I want to avoid the 100 MB "System reserved" partition which gets created when installing Windows 7 or Windows 8 on a blank hard drive. What is the easiest way do do this?

2 Answers 2


Apply the following steps when the Windows partitioning window apeares:

  1. Create a partition on the blank hard.
  2. Select the partition drive as the partition to install the Windows.
  3. Click "Next". The 100MB partition will be created.
  4. Delete the partition which you created in step 1.
  5. Extend the 100MB partition to the desired size.
  6. Select the partition which you extended in step 5 and select 'Format'
  7. After formatting the 'system reserved partition' will now become normal 'system' partition

In fact you install the Windows on the 100MB partition created by windows and you cheat the Windows. This solution is tested on Windows 7 and 8.1.


You've got to partition the hard drive first. You can do this from the Windows 7 setup screen that appears after you boot from the Windows 7 DVD.

  1. On the First setup screen, that asks you for language settings, Press Shift+F10. This will open a Command Prompt window. the first screen you see when running the installation

  2. Type diskpart and press Enter. This will start the disk partitioning program.

  3. Type the following commands into the command prompt window: list disk

    • list disk (Shows a list of the disks currently in the computer. Take note of the Disk ### and Size columns)
    • select disk 0 (Replace 0 with the number of the disk you want to install Windows on)
    • clean (Wipes the disk of any existing partitions, for example if you're re-installing over the top of an existing Windows install)
    • create partition primary (Creates a partition that takes up the whole disk - if you want to specify a size add size=80000 for an 80 GB partition) NOTE, if you create a partition with less space than the full disk, create a second partition now as well, taking up the rest of the space (Giving the Windows System Reserved partition nowhere to run to!)*
    • select partition 1 (Selects the partition you just created. If you want to list your partitions first if you created multiple, use list partition)
    • active (Marks the selected partition as the current 'active' partition)
    • format fs=ntfs quick (Formats the partition using the NTFS filesystem. Only performs a quick format, doesn't bother zeroing out every bit on the hard drive)
    • exit (That's it!)

Close the command prompt window and continue the installation as per normal. You will see your partition(s) on this screen, and lo and behold, no 'System Reserved':

A taste of awesome

  • I have followed this method with a Windows 8 installation disk and now I am unable to select this HDD to install Windows - the following extremely vague error message appears: We couldn't install Windows in the location you chose. Please check your media drive. Here's more info about what happened: 0x80300024. And no, formatting didn't change this.
    – caiosm1005
    Nov 8, 2013 at 4:40
  • @caiosm1005 - Are you sure its Windows 8, and not 8.1? Windows 8 worked perfectly fine for me. I chose the upgrade path from windows 8 to 8.1, and it kept my current partition
    – Robotnik
    Nov 8, 2013 at 5:13
  • It was Windows 8 indeed. Unfortunately I can't share a proper solution for those encountering the same problem since I just went on re-formatting the HDD in OSX, so that's kind of a cheat. After doing this I was able to install Windows 8 normally.
    – caiosm1005
    Nov 26, 2013 at 16:13
  • 1
    I tried this for Windows 10 over EFI, Windows Setup wouldn't let me choose the partition, complaining, "Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks." I tried again, adding convert gpt after the clean command. This caused Windows Setup to let me choose the partition, but setup immediately failed with another error. Aug 31, 2015 at 10:56
  • BIOS/UEFI and MBR/GPT aren't necessarily a requirement of each other (well, at least if you have CSM), but Windows pegs the partition table scheme to the firmware type. And therefore you absolutely need a separate boot partition with GPT (or well, technically you could do it away with a single FAT32 partition, but I don't think that's really usable in this century). The system reserved partition is thus an optional only if you boot in BIOS mode.
    – mirh
    Dec 29, 2020 at 15:46

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